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P-452设备用于在指挥和执行岗位之间以及与任何连接到交换机的用户之间进行成对和选择性环形连接。设备清单包括:4/8/12/20用户的抗噪电话机交换机、4/8/12用户的普通电话机交换机、电话机和耳机(多种型号)、电源变压器和外壳。
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