FR640785A - Acoustic signaling device - Google Patents

Acoustic signaling device

Info

Publication number: FR640785A
Authority: FR; France
Prior art keywords: signaling device; acoustic signaling; acoustic; signaling
Prior art date: 1927-09-12
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

Inventor

Henri Giger

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.)

1927-09-12

Filing date

1927-09-12

Publication date

1928-07-21

1927-09-12 Application filed filed Critical

1928-07-21 Application granted granted Critical

1928-07-21 Publication of FR640785A publication Critical patent/FR640785A/en

Status Expired legal-status Critical Current

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
- G10K5/00—Whistles

Landscapes

Physics & Mathematics (AREA)
Engineering & Computer Science (AREA)
Acoustics & Sound (AREA)
Multimedia (AREA)

FR640785D 1927-09-12 1927-09-12 Acoustic signaling device Expired FR640785A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
FR640785T		1927-09-12

Publications (1)

Publication Number	Publication Date
FR640785A true FR640785A (en)	1928-07-21

Family

ID=8997681

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR640785D Expired FR640785A (en)	1927-09-12	1927-09-12	Acoustic signaling device

Country Status (1)

Country	Link
FR (1)	FR640785A (en)

1927
- 1927-09-12 FR FR640785D patent/FR640785A/en not_active Expired

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