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公开(公告)号：US1048488A
公开(公告)日：1912-12-31
申请号：US1912707945
申请日：1912-07-05
Applicant: ASHCROFT MFG COMPANY
Inventor： BLANCHARD FREDERICK C , CROCKER ERNEST B , EDDY HOWARD E
CPC classification number: G01N2203/0282
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