Abstract: An electrical cooking apparatus for cooking natural substances such as rice, herbs, soups, and the like, the cooking device being divided into a lower cooking chamber and an upper cooling chamber, which includes a cooking container disposed within the lower cooking chamber, a valve member providing communication between the upper cooling chamber and the lower cooking container whereby the cooking steam rising from the cooking container and introduced through the valve member into the cooling chamber is condensed and returned as a liquid to the cooking container, a downwardly inclined baffle member disposed beneath the valve member for interrupting the flow of condensed liquid through the valve member and directing it to the side walls of the cooking chamber, and a heating member for the cooking apparatus.

Abstract: A foldable book stand which comprises, a front surface and a rear surface, said front surface having substantially parallel transverse crease lines disposed across the lower portion thereof, said front surface being folded on itself in opposite directions along said crease lines, said rear surface having triangular lateral flanges which are extendable from the rear surface along respective vertical crease lines and a transverse support member extendable from the rear surface along a horizontal crease line, said lateral flanges containing slots and said transverse support member containing end tabs for engaging in said slots, whereby the book stand is readily convertible from a flat folded state to an assembled state.

Abstract: A rock bolt installation system including a device for applying an insertion force to a rock bolt and a device for supplying high pressure jetting fluid through the rock bolt, and a method of operating the system to rapidly install rock bolts. The rock bolt itself includes a flow passage with a restricted nozzle outlet at one end and an exterior groove for removal of jetting fluid and formation cuttings.

Abstract: A method for controlling a mine roof by drilling one or more boreholes into the roof formation to a location adjacent the top of a mineral seam and hydraulically fracturing the roof formation to enlarge the natural caving zone or to induce orderly caving of a mine roof.

Abstract: A method for preventing fluid migration in coal seams by forming a substantially fluid impermeable zone across the fluid migration path by positioning at least one borehole in the coal seams in a direction generally parallel to the direction of fluid migration; injecting anhydrous hydrogen chloride or ammonia into the coal seams through the boreholes; and thereafter plugging the boreholes to prevent retrograde flow of the hydrogen chloride or ammonia.

Abstract: A method for controlling stress and increasing the load-bearing strength of support members, the support members comprising coal, of a coal mine wherein the method consists essentially of injecting ammonia or hydrochloric acid into the interior portions of the support members.