FR642680A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Improvements to electronic tubes used in telegraphy and wireless telephony and to electronic valves
Assignee: Radiotechnique SA
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Filing: 1927-03-22
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Granted: 1928-09-01
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Expires: 1947-03-22
Abstract
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Inventors
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Bibliographic Details
Application Number
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Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-06 04:11
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/38
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