Patent FR804178A successfully refreshed from Google Patents.
FR804178A
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FR
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Device for coupling, with a telephone receiver, a microphone such as, in particular, that of an electroacoustic device for the deaf
Assignee: Jules Lefevre
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Filing: 1935-07-11
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Granted: 1936-10-17
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Expires: 1955-07-11
Abstract
No abstract record available.
Inventors
- 👤 Jules Lefevre
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-26 16:59
CPC Classifications
H; H04; H04R; H04R27/00; H04R27/02
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Total Claims: 0
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References Cited (Backward Citations)
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