FR498566A - Improvements to sound transmitting devices - Google Patents

Improvements to sound transmitting devices

Info

Publication number
FR498566A
FR498566A FR498566DA FR498566A FR 498566 A FR498566 A FR 498566A FR 498566D A FR498566D A FR 498566DA FR 498566 A FR498566 A FR 498566A
Authority
FR
France
Prior art keywords
transmitting devices
sound transmitting
sound
devices
transmitting
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)
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 FR498566A publication Critical patent/FR498566A/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR498566D 1919-02-15 1919-04-23 Improvements to sound transmitting devices Expired FR498566A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB498566X 1919-02-15

Publications (1)

Publication Number Publication Date
FR498566A true FR498566A (en) 1920-01-15

Family

ID=1533761

Family Applications (1)

Application Number Title Priority Date Filing Date
FR498566D Expired FR498566A (en) 1919-02-15 1919-04-23 Improvements to sound transmitting devices

Country Status (1)

Country Link
FR (1) FR498566A (en)

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