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Invention Grant
US726879A Power-hammer. 失效
POWER-HAMMER。

  • Patent Title: Power-hammer.
  • Patent Title (中): POWER-HAMMER。
  • Application No.: US1902125975
    Application Date: 1902-10-04
  • Publication No.: US726879A
    Publication Date: 1903-05-05
  • Inventor: DAVIS GEORGE E
  • Applicant: DAVIS GEORGE E
  • Assignee: George E Davis
  • Current Assignee: George E Davis
  • Priority: US1902125975 1902-10-04
Power-hammer.
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