FR439904A - Appareil téléphonique simplifié - Google Patents

Appareil téléphonique simplifié

Info

Publication number
FR439904A
FR439904A FR439904A FR439904DA FR439904A FR 439904 A FR439904 A FR 439904A FR 439904 A FR439904 A FR 439904A FR 439904D A FR439904D A FR 439904DA FR 439904 A FR439904 A FR 439904A
Authority
FR
France
Prior art keywords
telephone device
simplified telephone
simplified
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
FR439904A
Other languages
English (en)
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
Filing date
Publication date
Application filed by Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Application granted granted Critical
Publication of FR439904A publication Critical patent/FR439904A/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; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
FR439904A 1911-04-19 Appareil téléphonique simplifié Expired FR439904A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR15735T

Publications (1)

Publication Number Publication Date
FR439904A true FR439904A (fr) 1912-06-27

Family

ID=8651904

Family Applications (2)

Application Number Title Priority Date Filing Date
FR15735A Expired FR15735E (fr) Appareil téléphonique simplifié
FR439904A Expired FR439904A (fr) 1911-04-19 Appareil téléphonique simplifié

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR15735A Expired FR15735E (fr) Appareil téléphonique simplifié

Country Status (1)

Country Link
FR (2) FR439904A (fr)

Also Published As

Publication number Publication date
FR15735E (fr) 1912-09-09

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