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公开(公告)号：US1272922A
公开(公告)日：1918-07-16
申请号：US19672017
申请日：1917-10-15
Applicant: DAVIS HAROLD SIMMONDS , DAVIS MARY DAVIDSON
Inventor： DAVIS HAROLD SIMMONDS , DAVIS MARY DAVIDSON
CPC classification number: G01N7/10
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