FR562932A - Speakerphone - Google Patents

Speakerphone

Info

Publication number
FR562932A
FR562932A FR562932DA FR562932A FR 562932 A FR562932 A FR 562932A FR 562932D A FR562932D A FR 562932DA FR 562932 A FR562932 A FR 562932A
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
Samuel-Moise Franses
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 FR562932A publication Critical patent/FR562932A/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
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR562932D 1923-02-13 1923-02-13 Speakerphone Expired FR562932A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR562932T 1923-02-13

Publications (1)

Publication Number Publication Date
FR562932A true FR562932A (en) 1923-11-22

Family

ID=8944650

Family Applications (1)

Application Number Title Priority Date Filing Date
FR562932D Expired FR562932A (en) 1923-02-13 1923-02-13 Speakerphone

Country Status (1)

Country Link
FR (1) FR562932A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3221834A (en) * 1963-05-09 1965-12-07 Hawley Products Co Acoustic diaphragm

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3221834A (en) * 1963-05-09 1965-12-07 Hawley Products Co Acoustic diaphragm

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