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US3230315A Two-wire switching system for fourwire circuits 失效
双线开关系统，用于四线电路

  • Patent Title: Two-wire switching system for fourwire circuits
  • Patent Title (中): 双线开关系统，用于四线电路
  • Application No.: US19969662
    Application Date: 1962-06-04
  • Publication No.: US3230315A
    Publication Date: 1966-01-18
  • Inventor: JUDY ROBERT V , ARSENEAU ROGER E
  • Applicant: ITT
  • Assignee: Itt
  • Current Assignee: Itt
  • Priority: US19969662 1962-06-04
  • Main IPC: H04M3/40
  • IPC: H04M3/40 ;  H04M3/56
Two-wire switching system for fourwire circuits
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