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