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Invention Grant
US3024980A Alpha-numeric hole checking system 失效
字母数字孔检查系统

  • Patent Title: Alpha-numeric hole checking system
  • Patent Title (中): 字母数字孔检查系统
  • Application No.: US77935458
    Application Date: 1958-12-10
  • Publication No.: US3024980A
    Publication Date: 1962-03-13
  • Inventor: DROEGE FREDERICK J , KLOTZ HERMAN J , MARCUS MITCHELL P
  • Applicant: IBM
  • Assignee: Ibm
  • Current Assignee: Ibm
  • Priority: US77935458 1958-12-10
Alpha-numeric hole checking system
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