control means for supplying {HEAD ~ a control signal} varying {TAIL ~ the inductance} of the inductive means, 
varying
control means for supplying { HEAD ~ a control signal } varying { TAIL ~ the inductance } of the inductive means ,
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH