FR779977A - Perfectionnements aux microphones - Google Patents

Perfectionnements aux microphones

Info

Publication number: FR779977A
Authority: FR; France
Prior art keywords: refinements; microphone; microphone refinements
Prior art date: 1934-01-08
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)

Inventor

Rene Louvet

Maurice Leon Labastrou

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.)

1934-01-08

Filing date

1934-01-08

Publication date

1935-04-17

1934-01-08 Application filed filed Critical

1935-04-17 Application granted granted Critical

1935-04-17 Publication of FR779977A publication Critical patent/FR779977A/fr

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers

Landscapes

Physics & Mathematics (AREA)
Engineering & Computer Science (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)

FR779977D 1934-01-08 1934-01-08 Perfectionnements aux microphones Expired FR779977A (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
FR779977T		1934-01-08

Publications (1)

Publication Number	Publication Date
FR779977A true FR779977A (fr)	1935-04-17

Family

ID=9203037

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR779977D Expired FR779977A (fr)	1934-01-08	1934-01-08	Perfectionnements aux microphones

Country Status (1)

Country	Link
FR (1)	FR779977A (fr)

1934
- 1934-01-08 FR FR779977D patent/FR779977A/fr not_active Expired

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