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