{HEAD ~ Slots} 14 include {TAIL ~ flat reference surfaces} 18 machined in member 12 in controlled parallel relationship 
{ HEAD ~ Slots } 14 include { TAIL ~ flat reference surfaces } 18 machined in member 12 in controlled parallel relationship
HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH