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DE7902331U1 - Push button switch - Google Patents

Push button switch

Info

Publication number
DE7902331U1
DE7902331U1 DE19797902331 DE7902331U DE7902331U1 DE 7902331 U1 DE7902331 U1 DE 7902331U1 DE 19797902331 DE19797902331 DE 19797902331 DE 7902331 U DE7902331 U DE 7902331U DE 7902331 U1 DE7902331 U1 DE 7902331U1
Authority
DE
Germany
Prior art keywords
contact
foil
switching
contact field
conductive material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DE19797902331
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE19797902331 priority Critical patent/DE7902331U1/en
Priority to FR8001312A priority patent/FR2447597A1/en
Publication of DE7902331U1 publication Critical patent/DE7902331U1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/78—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites
    • H01H13/785—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the material of the contacts, e.g. conductive polymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/83—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/36—Assembling printed circuits with other printed circuits
    • H05K3/361—Assembling flexible printed circuits with other printed circuits
    • H05K3/365—Assembling flexible printed circuits with other printed circuits by abutting, i.e. without alloying process
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00—Contacts
    • H01H2201/022—Material
    • H01H2201/026—Material non precious
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2203/00—Form of contacts
    • H01H2203/036—Form of contacts to solve particular problems
    • H01H2203/054—Form of contacts to solve particular problems for redundancy, e.g. several contact pairs in parallel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2205/00—Movable contacts
    • H01H2205/002—Movable contacts fixed to operating part
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/024—Properties of the substrate
    • H01H2209/038—Properties of the substrate transparent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/068—Properties of the membrane
    • H01H2209/082—Properties of the membrane transparent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/028—Printed information
    • H01H2219/03—Printed information in transparent keyboard
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/11—Printed elements for providing electric connections to or between printed circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/03—Conductive materials
    • H05K2201/0332—Structure of the conductor
    • H05K2201/0364—Conductor shape
    • H05K2201/0373—Conductors having a fine structure, e.g. providing a plurality of contact points with a structured tool
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10053—Switch

Landscapes

  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Push-Button Switches (AREA)

Description

Die Erfindung betrifft einen Tastschalter mit einer elastischen Schaltfolie, auf deren einer Seite ein Kontaktfeld aus elektrisch leitfähigem Material aufgebracht ist, mit einer zweiten, von der Schaltfolie durch eine Zwischenschicht im Abstand gehaltenen Kontaktfolie, die ein dem Kontaktfeld der Schaltfolie gegenüberliegendes Kontaktfeld aus elektrisch leitfähigem Material aufweist und mit einem Loch in der Zwi- · schenschicht im Bereich der Kontaktfeder, das ein Durchdrücken der Schaltfolie bis zur Eontaktfolie erlaubt .The invention relates to a pushbutton switch with an elastic switching film, on one side of which there is a contact field made of electrically conductive material is applied, with a second, from the switching foil by an intermediate layer held at a distance from the contact foil, which is connected to the contact field of the switching foil has opposite contact field made of electrically conductive material and with a hole in the middle · Layer in the area of the contact spring, which allows the switching foil to be pushed through to the contact foil .

Tastschalter dieser Art werden als Flächenfolienschalter bezeichnet. Die Kontaktfelder und die Anschlußleiter, werden in gedruckter Leitertechnik aufgebracht. Wird die obere Folie mit dem Finger leicht gegen die untere gedrückt, so wird der Abstand der beiden Folien im Loch überwunden und der Kontakt durch Berührung der metallischen Kontaktfelder geschlossen. Beim LoslassenPush-button switches of this type are referred to as flat membrane switches. The contact fields and the connecting conductors, are applied using printed conductor technology. If the upper slide is lightly against the with your finger if the lower is pressed, the distance between the two foils in the hole is overcome and the contact is made by touching the metallic contact fields closed. When letting go

Tp 5 Ler / 9.1.1979Tp 5 Ler / 9.1.1979

ti * ·ti *

- 2 - VPA 79 G 5005 BRD- 2 - VPA 79 G 5005 BRD

geht die berührte Schaltfolie aufgrund ihrer Elastizität und Spannung in ihre Ausgangslage zurück und der •Kontakt wird wieder geöffnet. Da die Kontaktfelder aus flächig aufgebrachtem Metall bestehen, ist es nicht möglich, den Tastschalter von unten zu beleuchten und beispielsweise im Bereich des Kontaktfeldes der Schaltfolie aufgebrachte Markierungen durch eine solche Beleuchtung sichtbar zu machen.the touched switching foil goes back to its original position due to its elasticity and tension • Contact is opened again. Since the contact fields consist of metal applied over a large area, it is not possible to illuminate the pushbutton switch from below and, for example, in the area of the contact field of the switching membrane to make applied markings visible by such lighting.

Der Erfindung liegt die Aufgabe zugrunde, einen Tastschalter der eingangs genannten Art so auszubilden, daß ein Lichtdurchlaß von unten durch die Kontaktfolie, das Loch in der Zwischenschicht und die Schaltfolie möglich ist, so daß Beschriftungen auf der Schaltfolie im Bereich des Kontaktfeldes auf diese Weise optisch sichtbar gemacht werden können.The invention is based on the object of designing a pushbutton switch of the type mentioned in such a way that light transmission from below through the contact foil, the hole in the intermediate layer and the switching foil is possible is, so that inscriptions on the switching membrane in the area of the contact field are optically visible in this way can be made.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß das leitfähige Material in den Kontaktfeldern nach Art einer Schraffierung in Form von parallel zueinanderliegenden strichförmigen Leitern aufgebracht ist. Bei dem erfindungsgemäßen Tastschalter kann durch die Folien im Bereich der Zwischenräume zwischen den strichförmigen Leitern Licht durchdringen. Auf diese Weise ist eine Beleuchtung von unten möglich.This object is achieved according to the invention in that the conductive material in the contact fields according to Art a hatching in the form of parallel line-shaped conductors is applied. at the push button switch according to the invention can through the foils in the area of the spaces between the line-shaped Ladders penetrate light. In this way, lighting from below is possible.

Eine besonders zweckmäßige Ausbildung besteht darin, daß die Leiter des einen Kontaktfeldes zu den Leitern des anderen Kontaktfeldes in einem Winkel von vorzugsweise 90° liegen. Bei dieser Ausgestaltung ist eine sichere Kontaktgabe beim Drücken auf die Schaltfolie gewährleistet.A particularly useful design consists in the fact that the conductors of a contact field to the conductors of the other contact field are at an angle of preferably 90 °. In this configuration, a secure contact is guaranteed when pressing on the switching membrane.

Die Erfindung ist nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:The invention is explained in more detail below with reference to an embodiment shown in the drawing. Show it:

- 3 - TPA 79 G 5005 BRD Fig. 1 einen Schnitt durch einen Tastschalter nach der Erfindung, und- 3 - TPA 79 G 5005 BRD Fig. 1 is a section through a push button switch according to the invention, and

Fig. 2 und 3 Ansichten der Kontaktfelder des Tastschalters nach Figur 1.FIGS. 2 and 3 are views of the contact fields of the pushbutton switch according to FIG. 1.

In der Figur 1 ist eine Schaltfolie 1 dargestellt, auf der ein Kontaktfeld 2 in gedruckter Leitertechnik aufgebracht ist, zu dem ein Anschlußleiter 3 führt. In gleicher Weise ist ein Kontaktfeld 4 auf einer Kontaktfolie 5 in gedruckter Leitertechnik aufgebracht, zu dem ein Leiter 6 führt. Die Kontaktfelder 2, 4 und die Leiter 3, 6 können aus Kupfer bestehen. Die Folien 1, 5 sind durch eine Zwischenfolie 7 aus Isoliermaterial im Abstand voneinander gehalten, welche ein Loch 8 im Bereich der Kontaktfelder 2, 4 besitzt. Die Folien 1, 5, 7 bes.tehen aus elastischem, lichtdurchlässigem Material. Wird in Richtung des Pfeiles 9 auf die Schaltfolie 1 gedrückt, so wird der Abstand zwischenIn the figure 1, a switching foil 1 is shown, on which a contact field 2 is applied in printed conductor technology is to which a connecting conductor 3 leads. In the same way, a contact field 4 is on a contact foil 5 applied in printed conductor technology, to which a conductor 6 leads. The contact fields 2, 4 and the conductors 3, 6 can be made of copper. The foils 1, 5 are made of insulating material by an intermediate foil 7 held at a distance from each other, which has a hole 8 in the area of the contact fields 2, 4. The slides 1, 5, 7 are made of elastic, translucent material. Is in the direction of arrow 9 on the Switch foil 1 pressed, the distance between

20' der Schaltfolie 1 und der Kontaktfolie 5 überwunden und das Kontaktfeld 2 gegen das Kontaktfeld 4 gedrückt, wodurch der Kontakt geschlossen wird.20 'of the switching foil 1 and the contact foil 5 overcome and the contact field 2 pressed against the contact field 4, whereby the contact is closed.

Aus den Figuren 2 und 3 ergibt sich, daß das leitfähige Material in den Kontaktfeldern 2 und 4 nach Art einer Schraffierung in Form "von parallel zueinanderliegenden, strichförmigen Leitern aufgebracht ist. Die Leiter sind dabei durch einen Ringleiter elektrisch miteinander verbunden, der mit den Leitern 3 bzw. 6 in Verbindung steht. Die Leiter des Kontaktfeldes 2 und die Leiter des Kontaktfeldes 4 liegen dabei in einem Winkel von 90° zueinander. Wird der dargestellte Tastschalter von unten beleuchtet, so kann Licht durch die Zwischenräume zwischen den strichförmigen Leitern der Kontaktfelder 2, 4 hin-From Figures 2 and 3 it follows that the conductive Material in the contact fields 2 and 4 in the manner of hatching in the form of "mutually parallel, Line-shaped ladders is applied. The conductors are electrical through a ring conductor connected to each other, which is connected to the conductors 3 and 6, respectively. The heads of the contact field 2 and the conductors of the contact field 4 are at an angle of 90 ° to one another. Will the Illuminated pushbutton switch shown from below, so light can pass through the spaces between the line-shaped conductors of the contact fields 2, 4 back

»•II Il»• II Il

- 4 - VPA 79 G 5005 BRD- 4 - VPA 79 G 5005 BRD

durchdringen, so daß ein Symbol auf der Schaltfolie oder auch auf der Kontaktfolie 5 durch Beleuchtung von unten sichtbar gemacht v/erden kann.penetrate, so that a symbol on the switching foil or on the contact foil 5 by lighting made visible from below.

Durch die feingeätzten, unter 90° gegeneinanderliegenden Leiterbahnen erhält man eine feingemaschte Struktur. Durch verschiedene Kreuzungswinkel der Leiterbahnen sind verschiedene Rasterstrukturen zur Kenn- * zeichnung von verschiedenen Symbolen oder Symbol-A finely meshed structure is obtained due to the fine-etched conductor tracks lying at 90 ° against each other. Due to the different crossing angles of the conductor tracks, there are different grid structures for the * identification of different symbols or symbols

gruppen möglich.groups possible.

1515th

2020th

2525th

3030th

3535

VPA 79 G 5005 BRD Zusammenfassung VPA 79 G 5005 BRD summary

TastschalterPush button switch

Die Erfindung bezieht sich auf einen Tastschalter mit einer elastischen Schaltfolie, auf deren einer Seite ein Kontaktfeld (2) aus elektrisch leitfähigem Material aufgebracht ist, mit einer zweiten, von der Schaltfolie durch eine Zwischenschicht im Abstand gehaltenen Kontaktfolie, die ein dem Kontaktfeld (2) --^ der Schaltfolie gegenüberliegendes Kontaktfeld aus elektrisch leitfähigem Material aufweist und mit einem Loch in der Zwischenschicht im Bereich der Kontaktfelder. Das leitfähige Material ist in den Kontaktfeldern nach Art einer Schraffierung in Form von parallel zueinanderliegenden strichförmigen Leitern aufgebracht, wobei die Leiter des einen Kontaktfeldes (2) zu den Leitern des anderen Kontaktfeldes in einem Winkel von vorzugsweise etwa 90° liegen (Fig. 2).The invention relates to a push button switch an elastic switching foil, on one side of which a contact field (2) made of electrically conductive material is applied, with a second, held at a distance from the switching foil by an intermediate layer Contact foil, which consists of a contact field opposite the contact field (2) - ^ the switching foil having electrically conductive material and with a hole in the intermediate layer in the area of the contact fields. The conductive material is in the contact fields in the manner of hatching in the form of mutually parallel Line-shaped conductors applied, the conductors of a contact field (2) to the Conductors of the other contact field at an angle of preferably about 90 ° (Fig. 2).

Claims (2)

• · - 1 - YPA 79 G 5005 BRD Schutzansprüche• · - 1 - YPA 79 G 5005 BRD protection claims 1. Tastschalter mit einer elastischen Schaltfolie, auf deren einer Seite ein Eontakfeld aus elektrisch leitfähigem Material aufgebracht ist, mit einer zweiten, Ton der Schaltfolie durch eine Zwischenschicht im Abstand gehaltenen Eontaktfolie, die ein dem Kontaktfeld der Schaltfolie gegenüberliegendes Kontaktfeld aus elektrisch leitfähigem Material aufweist und mit einem loch in der Zwischenschicht im Bereich der Kontaktfelder, das ein Durchdrücken der Schaltfolie bis zur Kontaktfolie erlaubt, dadurch gekennzeichnet , daß das leitfähige Material in den Kontaktfeldern (2, 4) nach Art einer Schraffierung in Form von parallel zueinanderliegenden strichförmigen leitern aufgebracht ist.1. Push-button switch with an elastic switching foil, on one side of which an Eontakfeld made of electrically conductive material Material is applied, with a second, tone of the switching membrane spaced by an intermediate layer held Eontaktfolie, which consists of a contact field opposite the contact field of the switching film has electrically conductive material and with a hole in the intermediate layer in the area of the contact fields, which allows the switching foil to be pushed through to the contact foil, characterized that the conductive material in the contact fields (2, 4) in the manner of hatching in the form of parallel lines ladders is applied. 2. Tastschalter nach Anspruch 1, dadurch gekennzeichnet , daß die Leiter des einen Kontaktfeldes (2) zu den Leitern des anderen Kontaktfeldes (4) in einem Winkel von vorzugsweise 90° zueinander liegen.2. Push button switch according to claim 1, characterized in that the head of the a contact field (2) to the conductors of the other contact field (4) at an angle of preferably 90 ° to each other.
DE19797902331 1979-01-29 1979-01-29 Push button switch Expired DE7902331U1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19797902331 DE7902331U1 (en) 1979-01-29 1979-01-29 Push button switch
FR8001312A FR2447597A1 (en) 1979-01-29 1980-01-22 Touch switch with printed circuit contacts - which have hatched form, mounted on transparent supports to permit passage of light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19797902331 DE7902331U1 (en) 1979-01-29 1979-01-29 Push button switch

Publications (1)

Publication Number Publication Date
DE7902331U1 true DE7902331U1 (en) 1980-07-10

Family

ID=6700486

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19797902331 Expired DE7902331U1 (en) 1979-01-29 1979-01-29 Push button switch

Country Status (2)

Country Link
DE (1) DE7902331U1 (en)
FR (1) FR2447597A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3338810A1 (en) * 1983-10-26 1985-05-09 Zwicker + Hensel Elektronische Schalttechnik GmbH, 5960 Olpe Key-pressure initiator
DE3615742A1 (en) * 1986-05-09 1987-11-12 Schoeller & Co Elektrotech Push-button film switch
DE3638667A1 (en) * 1986-11-12 1988-05-19 Motsch Alfons Flat switch
DE3721123A1 (en) * 1987-06-26 1989-01-05 Motsch Alfons Short-stroke push-button switch (pressure switch)
DE3737119A1 (en) * 1987-11-02 1989-05-11 Motsch Alfons Short-stroke push-button switch (key)
DE9012407U1 (en) * 1990-08-30 1992-01-09 Platz, Karl Otto, 5226 Reichshof Pressure switch element

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3130962A1 (en) * 1981-08-05 1983-02-24 Schadow Rudolf Gmbh FLAT SWITCH ARRANGEMENT
FR2531567A1 (en) * 1982-08-06 1984-02-10 Jaeger Transparent electrical switch.
US4990900A (en) * 1987-10-01 1991-02-05 Alps Electric Co., Ltd. Touch panel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2146281B1 (en) * 1971-07-16 1976-08-06 Ind Electronic En

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3338810A1 (en) * 1983-10-26 1985-05-09 Zwicker + Hensel Elektronische Schalttechnik GmbH, 5960 Olpe Key-pressure initiator
DE3615742A1 (en) * 1986-05-09 1987-11-12 Schoeller & Co Elektrotech Push-button film switch
DE3638667A1 (en) * 1986-11-12 1988-05-19 Motsch Alfons Flat switch
DE3721123A1 (en) * 1987-06-26 1989-01-05 Motsch Alfons Short-stroke push-button switch (pressure switch)
DE3737119A1 (en) * 1987-11-02 1989-05-11 Motsch Alfons Short-stroke push-button switch (key)
DE9012407U1 (en) * 1990-08-30 1992-01-09 Platz, Karl Otto, 5226 Reichshof Pressure switch element

Also Published As

Publication number Publication date
FR2447597A1 (en) 1980-08-22

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