Abstract: A calculating device installed in a calculator capable of performing arithmetical operations for discount is disclosed. The calculating device comprises a microprocessor for controlling the operations of the calculator; a discount calculating unit electrically connected to the microprocessor, the discount calculating unit being used to perform arithmetical operations for discount; an input unit electrically connected to the microprocessor, wherein the input unit comprises a plurality of discount operation keys installed on the calculator, and wherein when the discount operation keys are pressed orders for calculating arithmetical operations for discount are sent to the microprocessor; a random access memory electrically connected to the microprocessor, the random access memory being used to store data generated during the arithmetical operations for discount; and a display screen electrically connected to the microprocessor for displaying the data generated during the arithmetical operations for discount.

Abstract: A method having a summary function for a calculator is proposed. The method is matched with the operation of software program to let the calculator have both the functions of accounts check and surplus calculation. First, data of the desired items selectively recorded by the user are stored in a memory. A summary mode is then entered into to check each piece of subtotal data one by one for use of accounting of one day or one week. Moreover, each piece of data in the memory can be summed up. Thereby, the convenience in use of the calculator can be enhanced for stores or shop employees.

Abstract: A driving device of a double-display calculating machine includes first and second display devices and a controller that drives, at the same time, the displays of a calculation entered by an operator and being currently processed and a result thereof respectively on the first and second display devices. The first/second display device respectively includes n first/second common display inputs and m first/second segment display inputs. The controller includes a plurality of segment signal terminals and a plurality of common signal terminals. The segment signal terminals are commonly connected to the first/second segment display inputs of the first and second display devices. The common signal terminals are respectively connected to the first common display inputs of the first display device and to the second common display inputs of the second display device.

Abstract: A new paintable rubber composition made of a special formulation of materials including, for example, an SBR rubber elastomer and a thermoplastic polymeric stiffening agent means which may be used to provide the cured composition with a high flex modulus; and a new method of manufacturing a special flexible painted rubber product comprising molding, curing and painting said product.