This invention relates to the pest extermination arts and, more particularly, to {HEAD ~ such a system} which is permanently installed in {TAIL ~ a building} 
is permanently installed in
This invention relates to the pest extermination arts and , more particularly , to { HEAD ~ such a system } which is permanently installed in { TAIL ~ a building }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL