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Invention Grant
US2796127A Record card punching machine 失效
记录卡冲孔机

  • Patent Title: Record card punching machine
  • Patent Title (中): 记录卡冲孔机
  • Application No.: US39055253
    Application Date: 1953-11-06
  • Publication No.: US2796127A
    Publication Date: 1957-06-18
  • Inventor: JOHNSON REYNOLD B
  • Applicant: IBM
  • Assignee: Ibm
  • Current Assignee: Ibm
  • Priority: US39055253 1953-11-06
Record card punching machine
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