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公开(公告)号：US1981860A
公开(公告)日：1934-11-27
申请号：US59359832
申请日：1932-02-17
Applicant: GEBHARD LOUIS A , JACOBSON GEORGE E
Inventor： GEBHARD LOUIS A , JACOBSON GEORGE E
IPC: G01R31/25
CPC classification number: G01R31/25
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