A zoom lens system includes a first to a third lens groups. The first input latch has a first shutoff mechanism and the second input latch has a second shutoff mechanism. Based on a signal for the detection, the automatic thread cutting mechanism is operated to complete a thread cutting operation and to carry out a control to return into an initial state when a stop is performed with the thread cutting mechanism in power-ON executing the thread cutting work. The pair of bolt-receiving bores extend between the inner face and the outer face along bore axes at acute angles to the outer face. Novel functional heteromultimeric potassium channels having high affinity with propafenone are formed in conjunction with subunit Kv2. A cutter blade includes a bar engaged into the channel of the base and secured between the seat and the platform and includes an opening to form an angle arm having an inner rounded corner edge formed as a movable cutting edge.