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Invention Grant
US1094306A Spring door-closer. 失效
弹簧门关闭。

  • Patent Title: Spring door-closer.
  • Patent Title (中): 弹簧门关闭。
  • Application No.: US1913805097
    Application Date: 1913-12-06
  • Publication No.: US1094306A
    Publication Date: 1914-04-21
  • Inventor: CROSS JOHN A
  • Applicant: CROSS JOHN A
  • Assignee: John A Cross
  • Current Assignee: John A Cross
  • Priority: US1913805097 1913-12-06
Spring door-closer.
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