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公开(公告)号：US2172783A
公开(公告)日：1939-09-12
申请号：US10690836
申请日：1936-10-21
Applicant: PHILIPS NV
Inventor： HENDRIK ALINK ROELOF JAN , JOHANNES ANINGA
IPC: G03D7/00
CPC classification number: G03D7/00
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