{TAIL ~ The switch assembly} has three switches, {HEAD ~ each} of which selectively illuminates one of the filaments 
{ TAIL ~ The switch assembly } has three switches , { HEAD ~ each } of which selectively illuminates one of the filaments
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH