FR907660A
Expired / Lapsed
FR
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Improvements to amplifying equipment against deafness
Assignee: Albert Simpere
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Filing: 1944-11-03
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Granted: 1946-03-19
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Expires: 1964-11-03
Abstract
No abstract record available.
Inventors
- 👤 Albert Simpere
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-31 07:45
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/60; H04R25/604; H04R25/606
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