Patent US3155504A successfully refreshed from Google Patents.
Patent FR843643A successfully refreshed from Google Patents.
FR843643A
Expired / Lapsed
FR
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Translators of electrical energy into acoustic energy and related provisions
Assignee: Thales SA
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Filing: 1938-03-12
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Granted: 1939-07-06
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Expires: 1958-03-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-27 23:33
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/345
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