FR530661A - Improvements to warning devices - Google Patents

Improvements to warning devices

Info

Publication number
FR530661A
FR530661A FR530661DA FR530661A FR 530661 A FR530661 A FR 530661A FR 530661D A FR530661D A FR 530661DA FR 530661 A FR530661 A FR 530661A
Authority
FR
France
Prior art keywords
warning devices
warning
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
French (fr)
Inventor
Joseph Bethenod
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 filed Critical
Application granted granted Critical
Publication of FR530661A publication Critical patent/FR530661A/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
    • G10K9/02—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
    • G10K9/04—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 by compressed gases, e.g. compressed air

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR530661D 1920-08-09 1920-08-09 Improvements to warning devices Expired FR530661A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR530661T 1920-08-09

Publications (1)

Publication Number Publication Date
FR530661A true FR530661A (en) 1921-12-28

Family

ID=8923420

Family Applications (1)

Application Number Title Priority Date Filing Date
FR530661D Expired FR530661A (en) 1920-08-09 1920-08-09 Improvements to warning devices

Country Status (1)

Country Link
FR (1) FR530661A (en)

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