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公开(公告)号：US2858735A
公开(公告)日：1958-11-04
申请号：US42360654
申请日：1954-04-16
Applicant: BECKMAN INSTRUMENTS INC
Inventor： AHRENDT MERRILL E
IPC: G01J3/02
CPC classification number: G01J3/02 , G01J3/0213 , G01J3/0232
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