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Patent DE692963C successfully refreshed from Google Patents.
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DE692963C Expired / Lapsed DE ⏱️ 0.0 years remaining

microphone

Assignee: Appbau Ges Neumann & Borm
•
Filing: 1937-03-03
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Granted: 1940-06-29
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Expires: 1957-03-03
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Abstract

No abstract record available.

Inventors

  • 👤 Guenther Wurdel

Bibliographic Details

Application Number —
Jurisdiction DE
Data Source google_patents
Last Synchronized 2026-10-29 18:45
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/025

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