Patent FR750045A successfully refreshed from Google Patents.
FR750045A
Expired / Lapsed
FR
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Loudspeaker enhancements
Assignee: Joseph-Louis Routin
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Filing: 1932-04-23
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Granted: 1933-08-03
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Expires: 1952-04-23
Abstract
No abstract record available.
Inventors
- 👤 Joseph-Louis Routin
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-04 23:27
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R9/041; H04R7/00; H04R7/16; H04R7/18
Claims Analysis
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References Cited (Backward Citations)
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