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Invention Grant
US3224671A Rotary punching device 失效
旋转冲孔装置

  • Patent Title: Rotary punching device
  • Patent Title (中): 旋转冲孔装置
  • Application No.: US32017763
    Application Date: 1963-10-30
  • Publication No.: US3224671A
    Publication Date: 1965-12-21
  • Inventor: JOHNSON OLIVER D , MAYNARD KENNETH B
  • Applicant: IBM
  • Assignee: Ibm
  • Current Assignee: Ibm
  • Priority: US32017763 1963-10-30
Rotary punching device
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