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公开(公告)号：US3531581A
公开(公告)日：1970-09-29
申请号：US3531581D
申请日：1968-03-11
Applicant: BECKMAN INSTRUMENTS INC
Inventor： CHESEMORE JAMES R
CPC classification number: H05K3/3405 , H05K3/328 , H05K3/403 , H05K2201/09181 , H05K2201/1034
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