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Invention Grant
US1132308A Graphic recording apparatus. 失效
图形记录装置

  • Patent Title: Graphic recording apparatus.
  • Patent Title (中): 图形记录装置
  • Application No.: US1913796107
    Application Date: 1913-10-20
  • Publication No.: US1132308A
    Publication Date: 1915-03-16
  • Inventor: DEMPSTER JOHN T
  • Applicant: GEN ELECTRIC
  • Assignee: Gen Electric
  • Current Assignee: Gen Electric
  • Priority: US1913796107 1913-10-20
Graphic recording apparatus.
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