1978 Tong Chuan established, began manufactures all serial of Fixed terminal blocks, combination terminal blocks.1982 Make all serial of 10A, 30A fuse base.1984 Make all serial of Hoist push button switch, power press-retaining switch.1985 Make all serial of pilot light.1985 Make all serial of Buzzer & Alarm.1986 Make all serial of 22mm、25mm、30mm push button switch, selection switch.1986 Make all serial of 22mm、25mm switch box.1987 Make all serial of Foot switch.1989 Make all serial of cam switch.1990 Make all serial of relay socket1993 Develop and make all serial of double-layer terminal bl
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