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公开(公告)号：US2803779A
公开(公告)日：1957-08-20
申请号：US27448252
申请日：1952-02-07
Applicant: PHILIPS CORP
Inventor： RITTNER EDMUND S , GRACE FRANK E , SAMUEL FINE , BEUTEL GEORGE A
IPC: H01J31/04
CPC classification number: H01J31/04
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