FR819367A - Acoustic signaling device - Google Patents

Acoustic signaling device

Info

Publication number
FR819367A
FR819367A FR819367DA FR819367A FR 819367 A FR819367 A FR 819367A FR 819367D A FR819367D A FR 819367DA FR 819367 A FR819367 A FR 819367A
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
Olof Ingemar Harald Ekman
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 FR819367A publication Critical patent/FR819367A/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)
FR819367D 1936-03-20 1937-03-18 Acoustic signaling device Expired FR819367A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK819367X 1936-03-20

Publications (1)

Publication Number Publication Date
FR819367A true FR819367A (en) 1937-10-15

Family

ID=8153015

Family Applications (1)

Application Number Title Priority Date Filing Date
FR819367D Expired FR819367A (en) 1936-03-20 1937-03-18 Acoustic signaling device

Country Status (1)

Country Link
FR (1) FR819367A (en)

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