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FR790599A
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Improvement in the acoustics of speaking machines
Assignee: P A ZAHLEN
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Filing: 1935-05-28
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Granted: 1935-11-23
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Expires: 1955-05-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-26 04:49
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/345
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