FR490940A - Telephone receiver - Google Patents

Telephone receiver

Info

Publication number
FR490940A
FR490940A FR490940A FR490940DA FR490940A FR 490940 A FR490940 A FR 490940A FR 490940 A FR490940 A FR 490940A FR 490940D A FR490940D A FR 490940DA FR 490940 A FR490940 A FR 490940A
Authority
FR
France
Prior art keywords
telephone receiver
telephone
receiver
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
FR490940A
Other languages
French (fr)
Inventor
Alexander Marr
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
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR490940A publication Critical patent/FR490940A/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
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR490940A 1917-08-18 1918-07-08 Telephone receiver Expired FR490940A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB490940X 1917-08-18

Publications (1)

Publication Number Publication Date
FR490940A true FR490940A (en) 1919-05-15

Family

ID=1527008

Family Applications (1)

Application Number Title Priority Date Filing Date
FR490940A Expired FR490940A (en) 1917-08-18 1918-07-08 Telephone receiver

Country Status (1)

Country Link
FR (1) FR490940A (en)

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