1.Safe electricity use and electrician's tools+ 2.Electrical drawing recognition + 3.Inching control of three-phase asynchronous motors+ 4.one-way continuous operation+ 5.Sequential control+ 6.Rotary-controlling circuits+ 7.Position control+ 8.The control circuit for multiple places+ 9.The Y-△ Voltage-reduced Start Circuit+ 10.The CA6140 lathe+ 11.The M7130 lathe+ 12.Electrical Circuit Analysis of Z37+