Patent US3348229A successfully refreshed from Google Patents.
DE336844C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Box-like resonance hollow body for speaking machines and similar devices
Assignee: WALDEMAR HESS
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Filing: 1920-05-20
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Granted: 1921-05-13
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Expires: 1940-05-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-10-25 10:13
CPC Classifications
H; H04; H04R; H04R7/00
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Total Claims: 0
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