A further object of the invention is to provide {HEAD ~ a basement emergency exit} which is essentially flush with {TAIL ~ a basement wall} and is simple and easy to operate to provide a stairway and an automatically opening window 
is flush with
A further object of the invention is to provide { HEAD ~ a basement emergency exit } which is essentially flush with { TAIL ~ a basement wall } and is simple and easy to operate to provide a stairway and an automatically opening window
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH