CH214420A
Expired / Lapsed
CH
⏱️ 0.0 years remaining
Apparatus for self-control of one's own speech for the hard of hearing and the deaf.
Assignee: Ernst Dr Phil Bieri
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Filing: 1940-06-11
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Granted: —
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Expires: 1960-06-11
Abstract
No abstract record available.
Inventors
- 👤 Ernst Dr Phil Bieri
Bibliographic Details
Application Number
—
Jurisdiction
CH
Data Source
google_patents
Last Synchronized
2026-11-01 08:10
CPC Classifications
A; A61; A61F; A61F11/00; A61F11/30
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References Cited (Backward Citations)
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