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Invention Grant
US837675A Electrically-actuated signal-bell. 失效

  • Patent Title: Electrically-actuated signal-bell.
  • Application No.: US1906326643
    Application Date: 1906-07-18
  • Publication No.: US837675A
    Publication Date: 1906-12-04
  • Inventor: EDEN HAROLD W
  • Applicant: P R MFG COMPANY
  • Assignee: P R Mfg Company
  • Current Assignee: P R Mfg Company
  • Priority: US1906326643 1906-07-18
Electrically-actuated signal-bell.
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