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FR678199A - Speakerphone - Google Patents

Speakerphone

Info

Publication number
FR678199A
FR678199A FR678199DA FR678199A FR 678199 A FR678199 A FR 678199A FR 678199D A FR678199D A FR 678199DA FR 678199 A FR678199 A FR 678199A
Authority
FR
France
Prior art keywords
speakerphone
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
Other languages
French (fr)
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.)
FARRAND INDUCTOR CORP
Original Assignee
FARRAND INDUCTOR CORP
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 FARRAND INDUCTOR CORP filed Critical FARRAND INDUCTOR CORP
Application granted granted Critical
Publication of FR678199A publication Critical patent/FR678199A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/02—Loudspeakers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR678199D 1928-07-09 1929-07-09 Speakerphone Expired FR678199A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US678199XA 1928-07-09 1928-07-09

Publications (1)

Publication Number Publication Date
FR678199A true FR678199A (en) 1930-03-19

Family

ID=22078616

Family Applications (1)

Application Number Title Priority Date Filing Date
FR678199D Expired FR678199A (en) 1928-07-09 1929-07-09 Speakerphone

Country Status (1)

Country Link
FR (1) FR678199A (en)

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