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FR740828A - Electric acoustic warning device - Google Patents

Electric acoustic warning device

Info

Publication number
FR740828A
FR740828A FR740828DA FR740828A FR 740828 A FR740828 A FR 740828A FR 740828D A FR740828D A FR 740828DA FR 740828 A FR740828 A FR 740828A
Authority
FR
France
Prior art keywords
warning device
acoustic warning
electric acoustic
electric
warning
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.)
MOTO METER GAUGE AND EQUIPMENT
Original Assignee
MOTO METER GAUGE AND EQUIPMENT
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 MOTO METER GAUGE AND EQUIPMENT filed Critical MOTO METER GAUGE AND EQUIPMENT
Application granted granted Critical
Publication of FR740828A publication Critical patent/FR740828A/en
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
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR740828D 1931-08-08 1932-07-28 Electric acoustic warning device Expired FR740828A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US740828XA 1931-08-08 1931-08-08

Publications (1)

Publication Number Publication Date
FR740828A true FR740828A (en) 1933-02-01

Family

ID=22117605

Family Applications (1)

Application Number Title Priority Date Filing Date
FR740828D Expired FR740828A (en) 1931-08-08 1932-07-28 Electric acoustic warning device

Country Status (1)

Country Link
FR (1) FR740828A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112216261A (en) * 2019-07-09 2021-01-12 中车唐山机车车辆有限公司 Air whistle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112216261A (en) * 2019-07-09 2021-01-12 中车唐山机车车辆有限公司 Air whistle

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