An emergency basement exit 3, wherein {HEAD ~ said window} includes {TAIL ~ two hinged sashes} both interconnected to said at least one tread and both arranged to open as said at least one tread is pivoted downwardly 
includes
An emergency basement exit 3 , wherein { HEAD ~ said window } includes { TAIL ~ two hinged sashes } both interconnected to said at least one tread and both arranged to open as said at least one tread is pivoted downwardly
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL 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