FR717172A - Improvements to warning devices - Google Patents

Improvements to warning devices

Info

Publication number
FR717172A
FR717172A FR717172DA FR717172A FR 717172 A FR717172 A FR 717172A FR 717172D A FR717172D A FR 717172DA FR 717172 A FR717172 A FR 717172A
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)
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.)
Trico Products Corp
Original Assignee
Trico Products Corp
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 Trico Products Corp filed Critical Trico Products Corp
Application granted granted Critical
Publication of FR717172A publication Critical patent/FR717172A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR717172D 1930-10-03 1931-05-16 Improvements to warning devices Expired FR717172A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US717172XA 1930-10-03 1930-10-03

Publications (1)

Publication Number Publication Date
FR717172A true FR717172A (en) 1932-01-05

Family

ID=22103117

Family Applications (1)

Application Number Title Priority Date Filing Date
FR717172D Expired FR717172A (en) 1930-10-03 1931-05-16 Improvements to warning devices

Country Status (1)

Country Link
FR (1) FR717172A (en)

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