{HEAD ~ The object} of the invention is achieved by {TAIL ~ the fact} that the magnetic rotor is covered with a thin, corrosion stable, tightly fitting metal sleeve in the area of the magnets 
is achieved by
{ HEAD ~ The object } of the invention is achieved by { TAIL ~ the fact } that the magnetic rotor is covered with a thin , corrosion stable , tightly fitting metal sleeve in the area of the magnets
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH