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公开(公告)号：US1939332A
公开(公告)日：1933-12-12
申请号：US61720432
申请日：1932-06-14
Applicant: PHILIPS NV
Inventor： ALBERT BOUWERS , ADOLF HALBERTSMA NICOLAAS
IPC: G03B7/16
CPC classification number: G03B15/035 , G03B7/16
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