Roger Ulbricht, Ralph Cavalucci: Safety window of the tilt and turn type. Flour City Architectural Metals, Mark T Basseches, Paula T Basseches, July 20, 1982: US04339892 (12 worldwide citation)

The present invention is directed to a window of the tilt and turn type which may selectively be positioned in a locked condition wherein the window member is in coplanar alignment with the frame; in a vent position whereat the window is tiltable about a horizontal axis adjacent the lower edge there ...