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公开(公告)号：US1818258A
公开(公告)日：1931-08-11
申请号：US28613828
申请日：1928-06-18
Applicant: ISAACKS JAMES D
Inventor： ISAACKS JAMES D
IPC: G01L19/00
CPC classification number: G01L19/0007 , Y10T137/9682
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