To reform planing machine made in home, using rectifier bridge, which is mainly consisted of rectifier diode, to replace of directcurrent exciter in Shiheng special steel works.
石横特钢厂采用以整流二级管为主体的整流桥代替直流励磁发电机改造国产龙门刨床。
2
The bimetallic planing chips for carpenters were made by drop-forging high speed steel powder in carbon-steel (0. 45%C)containers.