FR853409A - écouteur téléphonique - Google Patents

écouteur téléphonique

Info

Publication number
FR853409A
FR853409A FR853409DA FR853409A FR 853409 A FR853409 A FR 853409A FR 853409D A FR853409D A FR 853409DA FR 853409 A FR853409 A FR 853409A
Authority
FR
France
Prior art keywords
phone earpiece
earpiece
phone
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)
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.)
Societe des Telephones Ericsson SA
Original Assignee
Societe des Telephones Ericsson SA
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 by Societe des Telephones Ericsson SA filed Critical Societe des Telephones Ericsson SA
Application granted granted Critical
Publication of FR853409A publication Critical patent/FR853409A/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
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
    • H04R13/02—Telephone receivers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR853409D 1938-11-05 1938-11-05 écouteur téléphonique Expired FR853409A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR853409T 1938-11-05

Publications (1)

Publication Number Publication Date
FR853409A true FR853409A (fr) 1940-03-19

Family

ID=9327074

Family Applications (1)

Application Number Title Priority Date Filing Date
FR853409D Expired FR853409A (fr) 1938-11-05 1938-11-05 écouteur téléphonique

Country Status (1)

Country Link
FR (1) FR853409A (fr)

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