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Claim 1

A WINDOW COMPRISING A RECTANGULAR SUPPORTING FRAME SEATED IN AN OPENING IN A WALL OF A BUILDING, A RECTANGULAR SASH ASSEMBLY MOUNTED IN SAID SUPPORTING FRAME ON VERTICALL ALIGNED PIVOT MEMBERS FOR SWINGING MOVEMENT INTO AND OUT OF THE PLANE OF SAID SUPPORTING FRAME WHEREBY THE ASSEMBLY MAY BE SWUNG TO A POSITION FRAME THE FACES THEREOF ARE REVERSED, A PAIR OF LATERALLY SPACED CONTINUOUS WEATHER SEALS INTERPOSED BETWEEN CONFRONTING EDGES OF THE SUPPORTING FRAME AND SASH ASSEMBLY SO AS TO PROVIDE AN AIRTIGHT SEAL WHEN THE SASH ASSEMBLY IS DISPOSED IN EITHER NORMAL OR REVERSED POSITION IN THE PLANE OF THE SUPPORTING FRAME, SAID SASH ASSEMBLY INCLUDING A HOLLOW TUBULAR FRAME OR GENERALLY RECTANGULAR CROSS SECTION, A PANE OF GLASS HAVING ITS MARGINS SECURED IN A GLAZING CHANNEL IN THE INNER EDGE ADJACENT THE OUTSIDE FACE OF SAID TUBULAR FRAME AND NORMALLY POSITIONED ON THE OUTSIDE OF THE BUILDING, A PANEL FORMING RECTANGULAR FRAME HINGED TO ONE SIDE OF SAID HOLLOW TUBULAR FRAME ADJACENT THE INSIDE EDGE THEREOF, A PANE OF GLASS MOUNTED IN SAID PANEL FORMING FRAME, SAID TUBULAR SASH FRAME AND SAID GLASS PANES DEFINING A COMPARTMENT FOR ACCOMMODATING A VENETAIN BLIND, PIVOTALLY MOUNTED LATCH MEMBERS CONCEALED IN THE SIDE OF SAID TUBULAR FRAME WHICH IS OPPOSITE THE HINGE CONNECTION WITH SAID PANEL FORMING FRAME, KEEPER MEMBERS ON SAID PANEL FORMING FRAME WHICH EXTEND THROUGH APERTURES IN SAID TUBULAR FRAME WHEN SAID PANEL FORMING FRAME IS CLOSED FOR COOPERATING WITH SAID LATCH MEMBERS, AND SAID TUBULAR FRAME HAVING APERTURES BETWEEN SAID WEATHER SEALS IN THE OUTER PERIPHERAL EDGE THEREOF WHICH PROVIDE ACCESS OT SAID LATCHES FOR MANUAL OPERATION THEREOF WHEN SAID SASH ASSEMBLY IS SWUNG OUT OF THE PLANE OF SAID SUPPORTING FRAME.