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公开(公告)号：US2651195A
公开(公告)日：1953-09-08
申请号：US14554250
申请日：1950-02-21
Applicant: IBM
Inventor： ENGSTROM JOHN R
IPC: G01H3/00
CPC classification number: G01H3/00
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公开(公告)号：US2627924A
公开(公告)日：1953-02-10
申请号：US9593449
申请日：1949-05-28
Applicant: IBM
Inventor： MALMROS GUSTAV V A , BARBER JR EDMUND A , ENGSTROM JOHN R
CPC classification number: B26F1/04
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