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Invention Grant
US889963A Mercury switch for railways and the like. 失效
铁路开关和类似的铁路开关。

  • Patent Title: Mercury switch for railways and the like.
  • Patent Title (中): 铁路开关和类似的铁路开关。
  • Application No.: US1908409585
    Application Date: 1908-01-06
  • Publication No.: US889963A
    Publication Date: 1908-06-09
  • Inventor: PFEIL ROBERT
  • Applicant: SIEMENS AG
  • Assignee: Siemens Ag
  • Current Assignee: Siemens Ag
  • Priority: US1908409585 1908-01-06
Mercury switch for railways and the like.
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