FR703916A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Method and device for recording sounds, by metallization of films or other surfaces
Assignee: Andre Betrancourt
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Filing: 1930-01-08
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Granted: 1931-05-08
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Expires: 1950-01-08
Abstract
No abstract record available.
Inventors
- 👤 Andre Betrancourt
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-23 08:56
CPC Classifications
G; G11; G11B; G11B5/00
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