FR551331A - Valve diaphragms for talking machines and similar devices - Google Patents

Valve diaphragms for talking machines and similar devices

Info

Publication number
FR551331A
FR551331A FR551331DA FR551331A FR 551331 A FR551331 A FR 551331A FR 551331D A FR551331D A FR 551331DA FR 551331 A FR551331 A FR 551331A
Authority
FR
France
Prior art keywords
similar devices
talking machines
valve diaphragms
diaphragms
valve
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.)
TELEGRAPHIE GmbH
Original Assignee
TELEGRAPHIE GmbH
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 TELEGRAPHIE GmbH filed Critical TELEGRAPHIE GmbH
Application granted granted Critical
Publication of FR551331A publication Critical patent/FR551331A/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
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR551331D 1922-05-12 1922-05-12 Valve diaphragms for talking machines and similar devices Expired FR551331A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR551331T 1922-05-12

Publications (1)

Publication Number Publication Date
FR551331A true FR551331A (en) 1923-04-03

Family

ID=8936780

Family Applications (1)

Application Number Title Priority Date Filing Date
FR551331D Expired FR551331A (en) 1922-05-12 1922-05-12 Valve diaphragms for talking machines and similar devices

Country Status (1)

Country Link
FR (1) FR551331A (en)

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