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FR877851A - Acoustic alarm device - Google Patents

Acoustic alarm device

Info

Publication number
FR877851A
FR877851A FR877851DA FR877851A FR 877851 A FR877851 A FR 877851A FR 877851D A FR877851D A FR 877851DA FR 877851 A FR877851 A FR 877851A
Authority
FR
France
Prior art keywords
alarm device
acoustic alarm
acoustic
alarm
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)
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of FR877851A publication Critical patent/FR877851A/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)
  • Indication Of The Valve Opening Or Closing Status (AREA)
  • Emergency Alarm Devices (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
FR877851D 1940-02-13 1941-02-24 Acoustic alarm device Expired FR877851A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2371949X 1940-02-13

Publications (1)

Publication Number Publication Date
FR877851A true FR877851A (en) 1943-01-05

Family

ID=20425439

Family Applications (1)

Application Number Title Priority Date Filing Date
FR877851D Expired FR877851A (en) 1940-02-13 1941-02-24 Acoustic alarm device

Country Status (5)

Country Link
US (1) US2371949A (en)
DE (1) DE746247C (en)
FR (1) FR877851A (en)
GB (1) GB605774A (en)
NL (1) NL59483C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477427A (en) * 1945-07-20 1949-07-26 Howard Foundry Company Pneumatic sounder
US2680422A (en) * 1951-01-26 1954-06-08 George D Woody Air horn
US2884892A (en) * 1954-12-01 1959-05-05 Nathan Mfg Corp Pneumatic sound producing device

Also Published As

Publication number Publication date
DE746247C (en) 1944-06-19
US2371949A (en) 1945-03-20
GB605774A (en) 1948-07-30
NL59483C (en) 1947-06-16

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