Commutator
    21.
    发明授权

    公开(公告)号:US2138636A

    公开(公告)日:1938-11-29

    申请号:US8467736

    申请日:1936-06-11

    Applicant: IBM

    Inventor: LAKE CLAIR D

    CPC classification number: G06F1/1615

    Accumulating device
    22.
    发明授权
    Accumulating device 失效
    累积装置

    公开(公告)号:US2084560A

    公开(公告)日:1937-06-22

    申请号:US73490134

    申请日:1934-07-13

    Applicant: IBM

    Inventor: LAKE CLAIR D

    CPC classification number: G06F7/42

    Electric card counter
    24.
    发明授权
    Electric card counter 失效
    电卡柜台

    公开(公告)号:US2043295A

    公开(公告)日:1936-06-09

    申请号:US63666332

    申请日:1932-10-07

    Applicant: IBM

    Inventor: LAKE CLAIR D

    CPC classification number: G06K1/12

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