Paper spacing device
    69.
    发明授权
    Paper spacing device 失效
    纸间隔装置

    公开(公告)号:US2126644A

    公开(公告)日:1938-08-09

    申请号:US17101337

    申请日:1937-10-26

    Applicant: IBM

    Inventor: LAKE CLAIR D

    CPC classification number: B41F1/00

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