Abstract: The present invention relates to an improved structure of an oven rack of a gas stove, employing a controller to automatically memorize and learn to change the flame from a gas source, such that when the height of the oven rack is adjusted, the flame is also adjusted in such a way that the flame at the bottom of a cooking utensil is always at the best position to provide maximum heating effectiveness.

Abstract: An automatic parking apparatus includes an automatic parking mechanism and a parking space identifying device. An upper plate of the automatic parking mechanism lifts up the chassis of a car. A control device on a baseplate of the mechanism keeps the mechanism moving along a straight line based on the input parking data and the data obtained by transceivers, a linear module, and the parking space identifying device. At the same time, available parking spaces may be detected so that cars may be placed correctly. The parking data are recorded, which makes it convenient to fetch the cars later on.

Abstract: A mechanical automatic pushbutton dialing device for telephones includes a roller and a planar plate having a plurality of holes. The roller is capable of rolling along the planar plate in a linear direction and selectively entering one of said holes of the planar plate by means of the arrangement of a motor, springs, and a roller guiding mechanism. The downward force generated at the instant when the roller falls into the hole is utilized to achieve automatic pushbutton dialing. The numerals to be dialed and the number of times of dialing may be freely determined by means of a motor controller. The device utilizes movable clamps to adjust the pushbutton dialing positions so as to match the size of the telephone set and the shape of the pushbuttons. Hence, the device may match different telephone models.