This method is already practised by this inventor as a simple and effective method in {HEAD ~ a design} of {TAIL ~ the magnetic device} 
This method is already practised by this inventor as a simple and effective method in { HEAD ~ a design } of { TAIL ~ the magnetic device }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL