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公开(公告)号：US961836A
公开(公告)日：1910-06-21
申请号：US1909489130
申请日：1909-04-10
Applicant: ASHCROFT MFG COMPANY
Inventor： BLANCHARD FREDERICK C , CROCKER ERNEST B , DARLING PHILIP G
CPC classification number: G01B5/26
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