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公开(公告)号：US3385160A
公开(公告)日：1968-05-28
申请号：US42768465
申请日：1965-01-25
Applicant: NAT RES DEV
Inventor： BARKER DAWSON JOHN , JACKMAN ELLIS DUNCAN
IPC: G01J3/32
CPC classification number: G01J3/32
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