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1.发明授权
公开(公告)号：US1973788A
公开(公告)日：1934-09-18
申请号：US64212432
申请日：1932-11-10
Applicant: PHILIPS NV
Inventor： HENDRIK ALINK REOLOF JAN , DE BOER JAN HENDRIK
IPC: G03C1/52
CPC classification number: G03C1/52 , Y10S430/14
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