{HEAD ~ A rotary direct current electric motor} in which rotor and stator members are each configured as annular rings, concentric with respect to each other, about an axis of {TAIL ~ rotation} 
{ HEAD ~ A rotary direct current electric motor } in which rotor and stator members are each configured as annular rings , concentric with respect to each other , about an axis of { TAIL ~ rotation }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL