FR851055A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Enhancements to signal-actuated alarm, calling and similar devices
Assignee: Marconis Wireless Telegraph Co Ltd
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Filing: 1939-03-02
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Granted: 1940-01-02
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Expires: 1959-03-02
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 10:45
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44
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