Key actuated punch
    18.
    发明授权
    Key actuated punch 失效
    钥匙致动冲头

    公开(公告)号:US2620877A

    公开(公告)日:1952-12-09

    申请号:US14416550

    申请日:1950-02-14

    Applicant: IBM

    Inventor: FURMAN FRANK J

    CPC classification number: G06K21/06

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