FR485924A - Improvements to sirens and other similar devices - Google Patents

Improvements to sirens and other similar devices

Info

Publication number
FR485924A
FR485924A FR485924DA FR485924A FR 485924 A FR485924 A FR 485924A FR 485924D A FR485924D A FR 485924DA FR 485924 A FR485924 A FR 485924A
Authority
FR
France
Prior art keywords
sirens
similar devices
similar
devices
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
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 FR485924A publication Critical patent/FR485924A/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
    • 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)
FR485924D 1916-06-30 1917-06-25 Improvements to sirens and other similar devices Expired FR485924A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE485924X 1916-06-30

Publications (1)

Publication Number Publication Date
FR485924A true FR485924A (en) 1918-02-20

Family

ID=1522580

Family Applications (1)

Application Number Title Priority Date Filing Date
FR485924D Expired FR485924A (en) 1916-06-30 1917-06-25 Improvements to sirens and other similar devices

Country Status (1)

Country Link
FR (1) FR485924A (en)

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