... field 4. reliable quality and reasonable price CRANE CONTROL PUSHBUTTON, Position Spring Return Selector Switch. AC. 50 or 60HZ, rated voltage to ... wharf, machine tools, textile machineries, etc. Other specifications: 10 lines, 8 lines, 6 lines, 4lines, 2 linesWork environ ment 1.Environment ... frequency is 2-80HZ, the acceleration is 0.79; remote control switch