As {HEAD ~ door} 12 is opened {TAIL ~ hook} 60 slips out of cocking hole 24 and the second configuration signal device 20 swings downward by gravity into the triggered position to indicate mail delivery 
is opened
As { HEAD ~ door } 12 is opened { TAIL ~ hook } 60 slips out of cocking hole 24 and the second configuration signal device 20 swings downward by gravity into the triggered position to indicate mail delivery
OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH