FR728628A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Improvements to blank phonograph records and their manufacturing processes
Assignee: Electrical Research Products Inc
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Filing: 1931-12-18
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Granted: 1932-07-08
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Expires: 1951-12-18
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
2026-10-25 05:07
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/68; G11B3/70
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