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1.发明授权
公开(公告)号：US2878722A
公开(公告)日：1959-03-24
申请号：US57610356
申请日：1956-04-04
Applicant: NAT RES DEV
Inventor： HORACE HOPKINS HAROLD , RICHARD BAKER LIONEL
IPC: G01J9/02
CPC classification number: G01J9/02
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