Rate extension punch
    36.
    发明授权
    Rate extension punch 失效
    速率延长打孔

    公开(公告)号:US2168414A

    公开(公告)日:1939-08-08

    申请号:US18205837

    申请日:1937-12-28

    Applicant: IBM

    Inventor: LAKE CLAIR D

    CPC classification number: B41J3/50

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