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Invention Grant
US2170390A Antisiphoning trap for plumbing fixtures 失效
卫生设备的反虹吸阱

  • Patent Title: Antisiphoning trap for plumbing fixtures
  • Patent Title (中): 卫生设备的反虹吸阱
  • Application No.: US16902937
    Application Date: 1937-10-14
  • Publication No.: US2170390A
    Publication Date: 1939-08-22
  • Inventor: RITTER ISAAC B
  • Applicant: FRANK T RAY
  • Assignee: Frank T Ray
  • Current Assignee: Frank T Ray
  • Priority: US16902937 1937-10-14
  • Main IPC: E03C1/294
  • IPC: E03C1/294
Antisiphoning trap for plumbing fixtures
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