Abstract: A prefabricated load-bearing wall panel has a layer of concrete attached to a plurality of spaced apart parallel metal wall studs. The slab support is achieved by flexible bolsters secured at spaced locations to each stud and fastened to a reinforcing mesh embedded in the concrete slab. The bolsters, which are partially embedded in the slab, provide compressive and tensile support for the slab on the studs in a direction generally perpendicular to the general plane of the slab. In addition, the wall panel exhibits a synergistic effect in terms of composite design, wind load strength and shear strength.

Abstract: Window controls for controlling large window units to permit the windows to be mechanically raised and lowered for ventilation purposes in a reliable, efficient, and low cost manner. The controls include means for automatically locking the window units against intrusion, when the windows are closed or partially open, and further the window controls are simplified by providing edge mounting frames for the glass only at the top and bottom edges of the glass. In some forms of the invention, where it is desired, the windows can carry automatically positionable screens for screening the vent openings.