FR497682A - Perfectionnement apporté aux sirènes - Google Patents

Perfectionnement apporté aux sirènes

Info

Publication number
FR497682A
FR497682A FR497682DA FR497682A FR 497682 A FR497682 A FR 497682A FR 497682D A FR497682D A FR 497682DA FR 497682 A FR497682 A FR 497682A
Authority
FR
France
Prior art keywords
sirens
improvement given
improvement
given
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
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 by Individual filed Critical Individual
Application granted granted Critical
Publication of FR497682A publication Critical patent/FR497682A/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)
FR497682D 1918-01-12 1919-03-31 Perfectionnement apporté aux sirènes Expired FR497682A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE497682X 1918-01-12

Publications (1)

Publication Number Publication Date
FR497682A true FR497682A (fr) 1919-12-12

Family

ID=1532986

Family Applications (1)

Application Number Title Priority Date Filing Date
FR497682D Expired FR497682A (fr) 1918-01-12 1919-03-31 Perfectionnement apporté aux sirènes

Country Status (1)

Country Link
FR (1) FR497682A (fr)

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