A combined lock device comprised of {HEAD ~ a key lock} linked up with {TAIL ~ at least one combination lock} 
linked up with
A combined lock device comprised of { HEAD ~ a key lock } linked up with { TAIL ~ at least one combination lock }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL