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公开(公告)号：US2344217A
公开(公告)日：1944-03-14
申请号：US37883641
申请日：1941-02-13
Applicant: KAPELLA LTD
Inventor： EDMUND REASON RICHARD , IVAN GARROD RAYMOND
IPC: G01B7/34
CPC classification number: G01B7/34
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