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公开(公告)号：US3498132A
公开(公告)日：1970-03-03
申请号：US3498132D
申请日：1968-02-23
Applicant: NAT RES DEV
Inventor： SMITH STANLEY DESMOND , HOUGHTON JOHN THEODORE
CPC classification number: G01J5/60 , G01J1/00 , G01N21/3504 , G01N21/538
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