FR806729A - Acoustic warning device - Google Patents

Acoustic warning device

Info

Publication number
FR806729A
FR806729A FR806729DA FR806729A FR 806729 A FR806729 A FR 806729A FR 806729D A FR806729D A FR 806729DA FR 806729 A FR806729 A FR 806729A
Authority
FR
France
Prior art keywords
warning device
acoustic warning
acoustic
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)
Inventor
Otto Blankmeister
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 FR806729A publication Critical patent/FR806729A/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
    • G10K7/00—Sirens
    • G10K7/02—Sirens in which the sound-producing member is rotated manually or by a motor

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR806729D 1936-05-25 1936-05-25 Acoustic warning device Expired FR806729A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR806729T 1936-05-25

Publications (1)

Publication Number Publication Date
FR806729A true FR806729A (en) 1936-12-23

Family

ID=9252038

Family Applications (1)

Application Number Title Priority Date Filing Date
FR806729D Expired FR806729A (en) 1936-05-25 1936-05-25 Acoustic warning device

Country Status (1)

Country Link
FR (1) FR806729A (en)

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