FR575131A - Appareil avertisseur sonore - Google Patents

Appareil avertisseur sonore

Info

Publication number
FR575131A
FR575131A FR575131DA FR575131A FR 575131 A FR575131 A FR 575131A FR 575131D A FR575131D A FR 575131DA FR 575131 A FR575131 A FR 575131A
Authority
FR
France
Prior art keywords
warning device
audible warning
audible
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
English (en)
Inventor
Helge Sven Albert Rydberg
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 FR575131A publication Critical patent/FR575131A/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
    • 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)
FR575131D 1923-12-29 1923-12-29 Appareil avertisseur sonore Expired FR575131A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR575131T 1923-12-29

Publications (1)

Publication Number Publication Date
FR575131A true FR575131A (fr) 1924-07-24

Family

ID=8953168

Family Applications (1)

Application Number Title Priority Date Filing Date
FR575131D Expired FR575131A (fr) 1923-12-29 1923-12-29 Appareil avertisseur sonore

Country Status (1)

Country Link
FR (1) FR575131A (fr)

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