FR642521A - Perfectionnements relatifs aux dispositifs avertisseurs - Google Patents

Perfectionnements relatifs aux dispositifs avertisseurs

Info

Publication number
FR642521A
FR642521A FR642521DA FR642521A FR 642521 A FR642521 A FR 642521A FR 642521D A FR642521D A FR 642521DA FR 642521 A FR642521 A FR 642521A
Authority
FR
France
Prior art keywords
improvements relating
warning devices
warning
devices
relating
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)
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.)
Sparks Withington Co
Original Assignee
Sparks Withington Co
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 Sparks Withington Co filed Critical Sparks Withington Co
Application granted granted Critical
Publication of FR642521A publication Critical patent/FR642521A/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)
FR642521D 1927-07-15 1927-10-18 Perfectionnements relatifs aux dispositifs avertisseurs Expired FR642521A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US642521TA 1927-07-15 1927-07-15

Publications (1)

Publication Number Publication Date
FR642521A true FR642521A (fr) 1928-08-30

Family

ID=1542716

Family Applications (1)

Application Number Title Priority Date Filing Date
FR642521D Expired FR642521A (fr) 1927-07-15 1927-10-18 Perfectionnements relatifs aux dispositifs avertisseurs

Country Status (1)

Country Link
FR (1) FR642521A (fr)

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