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Invention Grant
US729173A Contact device for electric railways. 失效

  • Patent Title: Contact device for electric railways.
  • Application No.: US1900003412
    Application Date: 1900-01-31
  • Publication No.: US729173A
    Publication Date: 1903-05-26
  • Inventor: HEWLETT EDWARD M
  • Applicant: GEN ELECTRIC
  • Assignee: Gen Electric
  • Current Assignee: Gen Electric
  • Priority: US1900003412 1900-01-31
Contact device for electric railways.
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