FR624943A - Improvements to acoustic signaling installations - Google Patents

Improvements to acoustic signaling installations

Info

Publication number
FR624943A
FR624943A FR624943DA FR624943A FR 624943 A FR624943 A FR 624943A FR 624943D A FR624943D A FR 624943DA FR 624943 A FR624943 A FR 624943A
Authority
FR
France
Prior art keywords
acoustic signaling
signaling installations
installations
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
John Pell Northey
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 FR624943A publication Critical patent/FR624943A/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
    • G10K7/06—Sirens in which the sound-producing member is driven by a fluid, e.g. by a compressed gas

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR624943D 1926-11-22 1926-11-22 Improvements to acoustic signaling installations Expired FR624943A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR624943T 1926-11-22

Publications (1)

Publication Number Publication Date
FR624943A true FR624943A (en) 1927-07-29

Family

ID=8987388

Family Applications (1)

Application Number Title Priority Date Filing Date
FR624943D Expired FR624943A (en) 1926-11-22 1926-11-22 Improvements to acoustic signaling installations

Country Status (1)

Country Link
FR (1) FR624943A (en)

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