FR686958A - Speakerphone - Google Patents

Speakerphone

Info

Publication number
FR686958A
FR686958A FR686958DA FR686958A FR 686958 A FR686958 A FR 686958A FR 686958D A FR686958D A FR 686958DA FR 686958 A FR686958 A FR 686958A
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)
Inventor
Herrmann Grau
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 filed Critical
Application granted granted Critical
Publication of FR686958A publication Critical patent/FR686958A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR686958D 1929-11-09 1929-12-19 Speakerphone Expired FR686958A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE686958X 1929-11-09

Publications (1)

Publication Number Publication Date
FR686958A true FR686958A (en) 1930-08-01

Family

ID=6598154

Family Applications (1)

Application Number Title Priority Date Filing Date
FR686958D Expired FR686958A (en) 1929-11-09 1929-12-19 Speakerphone

Country Status (1)

Country Link
FR (1) FR686958A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062926A (en) * 1959-03-20 1962-11-06 John J Ronci Magnet with vibratable armature

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062926A (en) * 1959-03-20 1962-11-06 John J Ronci Magnet with vibratable armature

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