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公开(公告)号：US2914987A
公开(公告)日：1959-12-01
申请号：US43420454
申请日：1954-06-03
Applicant: WALTER G FINCH
Inventor： CROSSWHITE JR HENRY M , FASTIE WILLIAM G
IPC: G01J3/04
CPC classification number: G01J3/04
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