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Invention Grant
US1073003A Trap-door lifter. 失效
TRAP-DOOR LIFTER。

  • Patent Title: Trap-door lifter.
  • Patent Title (中): TRAP-DOOR LIFTER。
  • Application No.: US1912724559
    Application Date: 1912-10-08
  • Publication No.: US1073003A
    Publication Date: 1913-09-09
  • Inventor: TROYER FRANK
  • Applicant: TROYER FRANK
  • Assignee: Frank Troyer
  • Current Assignee: Frank Troyer
  • Priority: US1912724559 1912-10-08
Trap-door lifter.
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