{HEAD ~ a surrounding ferrous cylindrical case} having an enclosing configuration and a hollow interior, said case having an outside surface, an inside surface, and {TAIL ~ a central axis}, 
{ HEAD ~ a surrounding ferrous cylindrical case } having an enclosing configuration and a hollow interior , said case having an outside surface , an inside surface , and { TAIL ~ a central axis } ,
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 TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH