Perforating Machine IBM's first patent (issued July 25, 1911) described an invention related to punched-card tabulation.
美国专利＃998631：打孔机IBM的第一项专利（1911年7月25日发布）介绍有关打孔卡制表的一项发明。
The binding module group is superposed by three boards, therefore the perforating binding machine has the advantages of less elements and easy assembling.
借此，所述装订模组由三片板体所叠置而成，因此构件较少，组装容易。
The binding module group is superposed by three boards, therefore the perforating binding machine has the advantages of less elements and easy assembling.
借此，所述装订模组由三片板体所叠置而成，因此构件较少，组装容易。
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