wherein {HEAD ~ the cylinder magnetization unit} includes {TAIL ~ a single exciting coil} which is wound about the connecting portion; and 
includes
wherein { HEAD ~ the cylinder magnetization unit } includes { TAIL ~ a single exciting coil } which is wound about the connecting portion ; and
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH