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Invention Grant
US943807A Double-acting spring-hinge. 失效

  • Patent Title: Double-acting spring-hinge.
  • Application No.: US1909480371
    Application Date: 1909-02-27
  • Publication No.: US943807A
    Publication Date: 1909-12-21
  • Inventor: BOMMER EMIL
  • Applicant: BOMMER EMIL
  • Assignee: Emil Bommer
  • Current Assignee: Emil Bommer
  • Priority: US1909480371 1909-02-27
Double-acting spring-hinge.
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