LU60045A1 - - Google Patents
Info
- Publication number
- LU60045A1 LU60045A1 LU60045DA LU60045A1 LU 60045 A1 LU60045 A1 LU 60045A1 LU 60045D A LU60045D A LU 60045DA LU 60045 A1 LU60045 A1 LU 60045A1
- Authority
- LU
- Luxembourg
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Telephonic Communication Services (AREA)
- Control Of Amplification And Gain Control (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19681816146 DE1816146B2 (en) | 1968-12-20 | 1968-12-20 | CIRCUIT ARRANGEMENT FOR LOUD TELEPHONE STATIONS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU60045A1 true LU60045A1 (en) | 1970-02-18 |
Family
ID=5716962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU60045D LU60045A1 (en) | 1968-12-20 | 1969-12-18 |
Country Status (9)
| Country | Link |
|---|---|
| AT (1) | AT299334B (en) |
| BE (1) | BE743453A (en) |
| CH (1) | CH502731A (en) |
| DE (1) | DE1816146B2 (en) |
| FR (1) | FR2026658A1 (en) |
| GB (1) | GB1228117A (en) |
| LU (1) | LU60045A1 (en) |
| NL (1) | NL149661B (en) |
| SE (1) | SE345362B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2460575A1 (en) * | 1979-06-29 | 1981-01-23 | Trt Telecom Radio Electr | Telephone set having earpiece amplifier - whose gain can be preset by user by dialling selected code using phone dial or pushbutton keyboard |
| DE2937638C2 (en) * | 1979-09-18 | 1981-11-26 | Krone Gmbh, 1000 Berlin | Non-latching button as an on / off switch and for volume adjustment |
| US4497980A (en) * | 1983-06-16 | 1985-02-05 | Itt Corporation | Handsfree circuit for telephone instrument |
-
1968
- 1968-12-20 DE DE19681816146 patent/DE1816146B2/en not_active Withdrawn
-
1969
- 1969-12-10 NL NL6918526A patent/NL149661B/en unknown
- 1969-12-16 CH CH1869569A patent/CH502731A/en not_active IP Right Cessation
- 1969-12-17 GB GB1228117D patent/GB1228117A/en not_active Expired
- 1969-12-17 FR FR6943694A patent/FR2026658A1/fr not_active Withdrawn
- 1969-12-18 AT AT1180469A patent/AT299334B/en not_active IP Right Cessation
- 1969-12-18 LU LU60045D patent/LU60045A1/xx unknown
- 1969-12-19 BE BE743453D patent/BE743453A/xx unknown
- 1969-12-22 SE SE1779869A patent/SE345362B/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE1816146B2 (en) | 1972-02-10 |
| SE345362B (en) | 1972-05-23 |
| DE1816146A1 (en) | 1970-07-02 |
| BE743453A (en) | 1970-06-19 |
| NL149661B (en) | 1976-05-17 |
| GB1228117A (en) | 1971-04-15 |
| FR2026658A1 (en) | 1970-09-18 |
| AT299334B (en) | 1972-06-12 |
| NL6918526A (en) | 1970-06-23 |
| CH502731A (en) | 1971-01-31 |