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公开(公告)号：US2661902A
公开(公告)日：1953-12-08
申请号：US20527851
申请日：1951-01-10
Applicant: NAT RES DEV
Inventor： SIEGFRIED WOLFF HEINZ , GRACE STORY MARJORIE , JACOB BEHRENS DERICK
IPC: G01N15/14
CPC classification number: G01N15/1468
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