The device 1, wherein {HEAD ~ said photoreceiver} is {TAIL ~ a CdS photoresistor} 
is
The device 1 , wherein { HEAD ~ said photoreceiver } is { TAIL ~ a CdS photoresistor }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL