FR852767A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Improvements to electro-magnetic sound recording devices
Assignee: Giovanni Liguori
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Filing: 1939-04-06
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Granted: 1940-03-02
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Expires: 1959-04-06
Abstract
No abstract record available.
Inventors
- 👤 Giovanni Liguori
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-25 21:59
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/22
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References Cited (Backward Citations)
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