江苏省煤矿研究所和常熟市煤矿通讯设备厂共同研制的SMY—CH_1型矿用电话查线器于1983年12月21日通过鉴定。 这种查线器为煤矿本质安全型自动式或共电式通讯系统巡线的专用工具,由电话机、电源和铃流源三部分组成。在井下有瓦斯、煤尘爆炸危险的埸所,它还可用作局部独立通讯工 Coal Institute of Jiangsu Province and Changshu City Coal Mine Communications Equipment Factory jointly developed by SMY-CH_1 mine telephone wire check in December 21, 1983 passed the appraisal. This wire checker is a special tool for patrolling the coal mine intrinsically safe automatic or common electric communication system and consists of a telephone, a power supply and a ring current source. It is also used as a local independent communications worker in wells where there is a risk of gas and coal dust explosions downhole