FR664037A
Expired / Lapsed
FR
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Installation for acoustic signaling by high frequency oscillations
Assignee: ELAC Electroacustic GmbH
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Filing: 1928-11-16
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Granted: 1929-08-28
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Expires: 1948-11-16
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
2026-10-22 23:53
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72
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