FR803291A
Expired / Lapsed
FR
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Device to improve hearing
Assignee: Henri Giesler
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Filing: 1936-03-11
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Granted: 1936-09-26
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Expires: 1956-03-11
Abstract
No abstract record available.
Inventors
- 👤 Henri Giesler
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-26 22:34
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/65
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References Cited (Backward Citations)
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