FR478148A - Loudspeaker telephone receiver - Google Patents

Loudspeaker telephone receiver

Info

Publication number
FR478148A
FR478148A FR478148A FR478148DA FR478148A FR 478148 A FR478148 A FR 478148A FR 478148 A FR478148 A FR 478148A FR 478148D A FR478148D A FR 478148DA FR 478148 A FR478148 A FR 478148A
Authority
FR
France
Prior art keywords
telephone receiver
loudspeaker telephone
loudspeaker
receiver
telephone
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
FR478148A
Other languages
French (fr)
Inventor
Maurice Meunier
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.)
Individual
Original Assignee
Individual
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of FR478148A publication Critical patent/FR478148A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/42—Combinations of transducers with fluid-pressure or other non-electrical amplifying means

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
FR478148A 1915-03-22 Loudspeaker telephone receiver Expired FR478148A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR20146T

Publications (1)

Publication Number Publication Date
FR478148A true FR478148A (en) 1915-11-24

Family

ID=8660109

Family Applications (2)

Application Number Title Priority Date Filing Date
FR20146A Expired FR20146E (en) Loudspeaker telephone receiver
FR478148A Expired FR478148A (en) 1915-03-22 Loudspeaker telephone receiver

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR20146A Expired FR20146E (en) Loudspeaker telephone receiver

Country Status (1)

Country Link
FR (2) FR478148A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1358837A (en) * 1970-07-02 1974-07-03 Ciba Geigy Uk Ltd Treatment of fibres and the fibres thus treated

Also Published As

Publication number Publication date
FR20146E (en) 1916-10-06

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