FR830910A - Improvements to telephone headsets - Google Patents

Improvements to telephone headsets

Info

Publication number
FR830910A
FR830910A FR830910DA FR830910A FR 830910 A FR830910 A FR 830910A FR 830910D A FR830910D A FR 830910DA FR 830910 A FR830910 A FR 830910A
Authority
FR
France
Prior art keywords
telephone headsets
headsets
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
Other languages
French (fr)
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 des Freins et Signaux Westinghouse SA
Original Assignee
Compagnie des Freins et Signaux Westinghouse 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 Compagnie des Freins et Signaux Westinghouse SA filed Critical Compagnie des Freins et Signaux Westinghouse SA
Application granted granted Critical
Publication of FR830910A publication Critical patent/FR830910A/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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR830910D 1936-12-18 1937-12-17 Improvements to telephone headsets Expired FR830910A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB830910X 1936-12-18

Publications (1)

Publication Number Publication Date
FR830910A true FR830910A (en) 1938-08-12

Family

ID=10540613

Family Applications (1)

Application Number Title Priority Date Filing Date
FR830910D Expired FR830910A (en) 1936-12-18 1937-12-17 Improvements to telephone headsets

Country Status (1)

Country Link
FR (1) FR830910A (en)

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