FR716223A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Device intended to transform sound vibrations into electrical oscillations or vice versa
Assignee: Koninklijke Philips NV
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Filing: 1931-04-28
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Granted: 1931-12-17
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Expires: 1951-04-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-03 11:17
CPC Classifications
H; H04; H04R; H04R11/00; H04R11/08
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