A folding stairway interconnected with a basement window and its lock, for unlocking the window and opening the window when {HEAD ~ the stairs} are pivoted from {TAIL ~ a closed or folded position} to a down, usable position 
A folding stairway interconnected with a basement window and its lock , for unlocking the window and opening the window when { HEAD ~ the stairs } are pivoted from { TAIL ~ a closed or folded position } to a down , usable position
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH