After opening the door, the user may manually “flip” switch 40, changing {HEAD ~ apparatus} 38 from an “OFF” state to {TAIL ~ an “ON” state} 
After opening the door , the user may manually “ flip ” switch 40 , changing { HEAD ~ apparatus } 38 from an “ OFF ” state to { TAIL ~ an “ ON ” state }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL