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Invention Grant
US944247A Apparatus for testing mine-gases. 失效
用于测试矿井气体的装置。

  • Patent Title: Apparatus for testing mine-gases.
  • Patent Title (中): 用于测试矿井气体的装置。
  • Application No.: US1909501509
    Application Date: 1909-06-11
  • Publication No.: US944247A
    Publication Date: 1909-12-21
  • Inventor: SMITH JOSEPH
  • Applicant: SMITH JOSEPH
  • Assignee: Joseph Smith
  • Current Assignee: Joseph Smith
  • Priority: US1909501509 1909-06-11
Apparatus for testing mine-gases.
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