DE490362C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Breast microphone with on / off switch
Assignee: Siemens and Halske AG
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Filing: —
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Granted: 1930-01-25
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Expires: 1947-01-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-10-28 22:34
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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