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Invention Grant
US2074051A Keyboard control mechanism 失效
键盘控制机制

  • Patent Title: Keyboard control mechanism
  • Patent Title (中): 键盘控制机制
  • Application No.: US1257535
    Application Date: 1935-03-23
  • Publication No.: US2074051A
    Publication Date: 1937-03-16
  • Inventor: FITCH CLYDE J
  • Applicant: IBM
  • Assignee: Ibm
  • Current Assignee: Ibm
  • Priority: US1257535 1935-03-23
Keyboard control mechanism
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