A device to detect the location of {HEAD ~ a plurality} of magnets uses a plurality of magnetic sensors, having {TAIL ~ sensor elements} arranged in a known fashion 
A device to detect the location of { HEAD ~ a plurality } of magnets uses a plurality of magnetic sensors , having { TAIL ~ sensor elements } arranged in a known fashion
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH