Patent FR557848A successfully refreshed from Google Patents.
FR557848A
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FR
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Improvements to sound-producing devices of the telephone receiver type
Assignee: NATHANIEL BALDWIN Inc
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Filing: 1922-10-26
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Granted: 1923-08-16
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Expires: 1942-10-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-01 11:20
CPC Classifications
H; H04; H04R; H04R11/00; B; B42; B42D; B42D15/00; B42D15/02; B42D15/04; B42D15/08
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