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FR701518A Expired / Lapsed FR ⏱️ 0.0 years remaining

Postcard or other with invisible sound recording layer

Assignee: LEVY ET NEURDEIN ETS
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Filing: 1929-11-28
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Granted: 1931-03-17
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Expires: 1949-11-28
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Abstract

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Bibliographic Details

Application Number —
Jurisdiction FR
Data Source google_patents
Last Synchronized 2026-10-27 19:52
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/68; G11B3/70

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