FR579357A - Plaque téléphonique - Google Patents

Plaque téléphonique

Info

Publication number
FR579357A
FR579357A FR579357DA FR579357A FR 579357 A FR579357 A FR 579357A FR 579357D A FR579357D A FR 579357DA FR 579357 A FR579357 A FR 579357A
Authority
FR
France
Prior art keywords
telephone plate
telephone
plate
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
English (en)
Inventor
Georges Lakhovsky
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 FR579357A publication Critical patent/FR579357A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms And Bellows (AREA)
FR579357D 1923-06-14 1923-06-14 Plaque téléphonique Expired FR579357A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR579357T 1923-06-14

Publications (1)

Publication Number Publication Date
FR579357A true FR579357A (fr) 1924-10-15

Family

ID=8956044

Family Applications (1)

Application Number Title Priority Date Filing Date
FR579357D Expired FR579357A (fr) 1923-06-14 1923-06-14 Plaque téléphonique

Country Status (2)

Country Link
FR (1) FR579357A (fr)
GB (1) GB217579A (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236958A (en) * 1961-04-25 1966-02-22 Electronic Res Associates Inc Loudspeaker system
US4048454A (en) * 1974-12-02 1977-09-13 Barcus Lester M Sonic transducer employing rigid radiating member
US4013846A (en) 1975-08-28 1977-03-22 Minnesota Mining And Manufacturing Company Piston loudspeaker
JPS5379525A (en) * 1976-12-23 1978-07-14 Sony Corp Compound diaphtagm for speakers

Also Published As

Publication number Publication date
GB217579A (en) 1924-12-24

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