CH137145A
Expired / Lapsed
CH
⏱️ 0.0 years remaining
Improvement provided to telephone transmitters.
Assignee: Bell Telephone Mfg
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Filing: 1928-05-09
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Granted: —
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Expires: 1948-05-09
Abstract
No abstract record available.
Inventors
- 👤 Co Bell Telephon Manufacturing
Bibliographic Details
Application Number
—
Jurisdiction
CH
Data Source
google_patents
Last Synchronized
2026-10-23 00:52
CPC Classifications
H; H04; H04R; H04R21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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