DE374035C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Arrangement to prevent unauthorized use of telephone sets by locking the hook switch in its lowest position
Assignee: Individual
•
Filing: —
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Granted: 1923-04-19
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Expires: 1940-04-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-02 19:32
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/66; H04M1/667
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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