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公开(公告)号：US3251217A
公开(公告)日：1966-05-17
申请号：US26294163
申请日：1963-03-05
Applicant: UNIV IOWA STATE RES FOUND INC
Inventor： MONTE EVENS FLOYD , FASSEL VELMER A
IPC: G01N33/20
CPC classification number: G01N33/203
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