The telephone to a so-called intrinsic safety device.

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• 2. 矿用本质安全型闭锁式扩音电话电路装置 [P] . 中国专利： CN201789542U . 2011.04.06
• 3. COMPOSITE CABLE FOR INTRINSICALLY SAFETY, SIGNAL PROCESSING DEVICE HAVING COMPOSITE CABLE FOR INTRINSICALLY SAFETY, TEACH PENDANT HAVING COMPOSITE CABLE FOR INTRINSICALLY SAFETY, AND ROBOT HAVING COMPOSITE CABLE FOR INTRINSICALLY SAFETY [P] . 日本专利： JP2018073566A . 2018-05-10

  机译： 用于本质安全的复合电缆，具有用于本质安全的复合电缆的信号处理设备，用于内部安全的示教盒具有复合电缆的，用于本质安全的机器人悬架用于复合材料的机器人

• 4. INTRINSIC SAFETY BARRIER DEVICE. [P] . NL165011C . 1981-02-16

  机译： 内部安全屏障设备。

• 5. INTRINSIC SAFETY BARRIER DEVICE. [P] . NL165011B . 1980-09-15

  机译： 内部安全屏障设备。

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