Abstract: A game device comprising mainly a geometric body having at least two flat external faces, each of the flat external faces is provided with at least one indicating piece, each of the indicating piece is provided with at least one indicating face, each of the indicating faces is provided with at least one indicium.

Abstract: A method for producing copper sulfate from waste copper-containing liquid including the steps of recovery of acidic and basic copper-containing liquid, and neutralization of the liquid to form crystalline copper sulfate, wherein the ratio of acidic to basic copper-containing liquid, temperature, pH value and the concentration of copper ion in the resultant solution of each step is being controlled such that the solid copper sulfate is obtained in high yield and purity and will have a larger particle size, and at the same time, the filtrate will contain copper ion in a concentration below 0.3 ppm before being expelled to the surroundings.

Abstract: The convertible bed of this invention includes a bed which can be converted to a chair so that the user can sit on it. The user can push a button to actuate a driving means to rotate the chair so that the user can easily fall into sleep, where the button can be released naturally, and the chair can automatically convert to a bed. A brake means, a speed control means, a safety belt for restraining the user, and warning lights are also provided.

Abstract: A competitive game device having mainly a plurality of balls, two sets of obliquely mounted tubes, at least two slidable blocks slidably mounted on two sets of horizontal guide rails and connected with bellow-shaped tubes so that a player can deflect the balls put into the tubes by an opponent player to a winning basket of the player. Stopper means is also provided on each of the tubes so that the players can deposit some balls at selected tubes and thereafter open the stopper means at a selected time. A pivotably mounted ball collecting means, a pointer, and a scale are also provided.