Patent US5113257A successfully refreshed from Google Patents.
DE863085C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Sound guide equipped with a loudspeaker
Assignee: Individual
•
Filing: 1950-03-29
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Granted: 1953-01-15
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Expires: 1970-03-29
Abstract
No abstract record available.
Inventors
- 👤 Fritz Gabriel
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-04 00:55
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2853; H04R1/2857
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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