辽宁省有线电一厂、抚顺煤炭研究所革命职工,在毛泽东思想指引下,经过反复试验,研制成功了我国第一台全安全话机。在煤矿井下、石油企业、化工厂,特别是在易爆气体的场所,不能使用通常的电话机,而使用一种特制的隔爆话机,目前世界上认为最好的是英制的重209斤,通话距离10公里,苏制Мб—рВ安全话机,重50公斤,通话距离8公里,这种话机通话一万次允许引爆一次。而 Under the guidance of Mao Zedong Thought, a number of revolutionary workers in Liaoning Province Electric Cable Factory and Fushun Coal Research Institute have successfully developed China’s first all-security phone after trial and error. In the coal mine, oil companies, chemical plants, especially in explosive gas venues, can not use the usual telephone, and use a special explosion-proof phone, the best in the world is the English system weighs 209 pounds, Call distance of 10 km, Soviet-made Мб-рВ security phone, weighing 50 kg, call distance of 8 km, this phone call to allow a thousand times to detonate once. and