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公开(公告)号：US2305777A
公开(公告)日：1942-12-22
申请号：US36714040
申请日：1940-11-25
Applicant: GERHARD HANSEN , HANS GEHNE
Inventor： GERHARD HANSEN , HANS GEHNE
IPC: G01N21/43
CPC classification number: G01N21/43
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