FR835245A - écouteur téléphonique - Google Patents

écouteur téléphonique

Info

Publication number
FR835245A
FR835245A FR835245DA FR835245A FR 835245 A FR835245 A FR 835245A FR 835245D A FR835245D A FR 835245DA FR 835245 A FR835245 A FR 835245A
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)
Inventor
Alfons E Rappenecker
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 FR835245A publication Critical patent/FR835245A/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)
FR835245D 1937-03-16 1938-03-14 écouteur téléphonique Expired FR835245A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH835245X 1937-03-16

Publications (1)

Publication Number Publication Date
FR835245A true FR835245A (fr) 1938-12-15

Family

ID=4540639

Family Applications (1)

Application Number Title Priority Date Filing Date
FR835245D Expired FR835245A (fr) 1937-03-16 1938-03-14 écouteur téléphonique

Country Status (1)

Country Link
FR (1) FR835245A (fr)

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