FR731544A - Perfectionnements aux appareils acoustiques - Google Patents

Perfectionnements aux appareils acoustiques

Info

Publication number
FR731544A
FR731544A FR731544DA FR731544A FR 731544 A FR731544 A FR 731544A FR 731544D A FR731544D A FR 731544DA FR 731544 A FR731544 A FR 731544A
Authority
FR
France
Prior art keywords
hearing devices
hearing
devices
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)
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 Westinghouse
Original Assignee
Compagnie des Freins Westinghouse
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 Westinghouse filed Critical Compagnie des Freins Westinghouse
Application granted granted Critical
Publication of FR731544A publication Critical patent/FR731544A/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/02—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR731544D 1931-05-08 1932-02-18 Perfectionnements aux appareils acoustiques Expired FR731544A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US731544XA 1931-05-08 1931-05-08

Publications (1)

Publication Number Publication Date
FR731544A true FR731544A (fr) 1932-09-03

Family

ID=22112044

Family Applications (1)

Application Number Title Priority Date Filing Date
FR731544D Expired FR731544A (fr) 1931-05-08 1932-02-18 Perfectionnements aux appareils acoustiques

Country Status (1)

Country Link
FR (1) FR731544A (fr)

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