1976年5月,铁道部工电局于天津信号工厂召开了道岔握柄及信号选别器两项改进产品试用情况座谈会。会议认为,上述两项产品的改进比较切合实际,提高了安全性能,延长了使用寿命,大家对改进方案和样机表示满意。天津信号工厂将根据这次会议的意见,修改图纸,进行投产准备。 In May 1976, the Ministry of Railways Electric Power Bureau held two symposiums on the probationary situation of two improved products such as pick-up handle and signal selector at Tianjin Signal Factory. The meeting held that the improvement of the above two products was more realistic, improved the safety performance and prolonged the service life, and everyone was satisfied with the improvement plan and prototype. Tianjin signal factory will be based on the views of this meeting, modify the drawings, production ready.