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Invention Grant
US974190A Curve-drawing instrument. 失效

  • Patent Title: Curve-drawing instrument.
  • Application No.: US1903150099
    Application Date: 1903-03-30
  • Publication No.: US974190A
    Publication Date: 1910-11-01
  • Inventor: ROBINSON LEWIS T
  • Applicant: GEN ELECTRIC
  • Assignee: Gen Electric
  • Current Assignee: Gen Electric
  • Priority: US1903150099 1903-03-30
Curve-drawing instrument.
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