FR640785A - Acoustic signaling device - Google Patents

Acoustic signaling device

Info

Publication number
FR640785A
FR640785A FR640785DA FR640785A FR 640785 A FR640785 A FR 640785A FR 640785D A FR640785D A FR 640785DA FR 640785 A FR640785 A FR 640785A
Authority
FR
France
Prior art keywords
signaling device
acoustic signaling
acoustic
signaling
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
Henri Giger
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 FR640785A publication Critical patent/FR640785A/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
    • G10K5/00—Whistles

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR640785D 1927-09-12 1927-09-12 Acoustic signaling device Expired FR640785A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR640785T 1927-09-12

Publications (1)

Publication Number Publication Date
FR640785A true FR640785A (en) 1928-07-21

Family

ID=8997681

Family Applications (1)

Application Number Title Priority Date Filing Date
FR640785D Expired FR640785A (en) 1927-09-12 1927-09-12 Acoustic signaling device

Country Status (1)

Country Link
FR (1) FR640785A (en)

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