FR874980A - Perfectionnement apporté aux avertisseurs sonores - Google Patents

Perfectionnement apporté aux avertisseurs sonores

Info

Publication number
FR874980A
FR874980A FR874980DA FR874980A FR 874980 A FR874980 A FR 874980A FR 874980D A FR874980D A FR 874980DA FR 874980 A FR874980 A FR 874980A
Authority
FR
France
Prior art keywords
further development
audible warning
warning devices
audible
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
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.)
COMM APP MARCHAL SOC D EXPL
Original Assignee
COMM APP MARCHAL SOC D EXPL
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 COMM APP MARCHAL SOC D EXPL filed Critical COMM APP MARCHAL SOC D EXPL
Application granted granted Critical
Publication of FR874980A publication Critical patent/FR874980A/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
    • G10K13/00—Cones, diaphragms, or the like, for emitting or receiving sound in general

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR874980D 1941-04-28 1941-04-28 Perfectionnement apporté aux avertisseurs sonores Expired FR874980A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR874980T 1941-04-28

Publications (1)

Publication Number Publication Date
FR874980A true FR874980A (fr) 1942-09-02

Family

ID=9359949

Family Applications (1)

Application Number Title Priority Date Filing Date
FR874980D Expired FR874980A (fr) 1941-04-28 1941-04-28 Perfectionnement apporté aux avertisseurs sonores

Country Status (1)

Country Link
FR (1) FR874980A (fr)

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