FR503240A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Vibrating blade writing device for phonographic recording of radio signals and telephone communications (wired or wireless)
Assignee: Societe des Etablissements Gaumont
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Filing: 1917-03-08
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Granted: 1920-06-05
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Expires: 1937-03-08
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
2026-10-26 12:46
CPC Classifications
H; H04; H04L; H04L15/00; H04L15/24; H04L15/28; H04L15/30
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