FR562727A - Speakerphone - Google Patents

Speakerphone

Info

Publication number
FR562727A
FR562727A FR562727DA FR562727A FR 562727 A FR562727 A FR 562727A FR 562727D A FR562727D A FR 562727DA FR 562727 A FR562727 A FR 562727A
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
Ettore Bellini
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 FR562727A publication Critical patent/FR562727A/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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR562727D 1923-02-27 1923-02-27 Speakerphone Expired FR562727A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR562727T 1923-02-27

Publications (1)

Publication Number Publication Date
FR562727A true FR562727A (en) 1923-11-17

Family

ID=8944488

Family Applications (1)

Application Number Title Priority Date Filing Date
FR562727D Expired FR562727A (en) 1923-02-27 1923-02-27 Speakerphone

Country Status (1)

Country Link
FR (1) FR562727A (en)

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