INTERCOMMUNICATING LOCKOUT TELEPHONE SYSTEM.

• 1. 一种煤矿用无线对讲扩音电话系统 [P] . 中国专利： CN208434026U . 2019.01.25
• 2. 一种煤矿用无线对讲扩音电话系统 [P] . 中国专利： CN108600486A . 2018-09-28
• 3. INTERCOMMUNICATING SELECTIVE LOCKOUT TELEPHONE SYSTEM. [P] . 美国专利： US1181559A . 1916-05-02

  机译： 相互通信的选择性锁定电话系统。

• 4. Lockout mechanism for intercommunicating telephone systems [P] . 美国专利： US1419403A . 1922-06-13

  机译： 互通电话系统的锁定机制

• 5. TELEPHONE INTERCOMMUNICATIONS SYSTEM. [P] . IE38355L . 1974-04-12

  机译： 电话对讲系统。

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