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| Number | Title | Issue Date |
| 6926530 | Game apparatuses and methods for use in teaching the addition and subtraction of positive and negative numbers A game apparatus and a method for assisting in teaching the addition and subtraction of positive and, especially, negative numbers, are based on the Null Theory of Adding and Subtracting Positive and Negative Numbers. The apparatus comprises (a) a plurality of posit... | 08/09/2005 |
| 6513708 | Mathematics teaching system A mathematics teaching system for visually and physically teaching a student how to perform multiplication and division calculations in a simple to understand format. The mathematics teaching system includes a housing having a plurality of apertures align... | 02/04/2003 |
| 6213954 | Pulse meter Accordingly, the object of the present invention is to provide a pulse meter comprising a pen body installed with a counting microprocessor, and a liquid crystal display (LCD) and a counter are installed on the proper position of the pen body. The countin... | 04/10/2001 |
| 5028764 | Calculating instrument and method therefor A calculator for doing multiplication having an integral ball point pen. The calculator includes a ball point pen, an inner cylinder fixedly connected to the ball point pen, and an outer cylinder angularly displaceable relative to the inner cylinder. The ... | 07/02/1991 |
| 4993050 | Portable touch activated counter/marker A counter/marker apparatus which comprises a head assembly including a counter mechanism, a first elongated sleeve fixed to the head assembly, and a second elongated sleeve dimensioned and configured for sliding axial concentric movement within the first ... | 02/12/1991 |
| 4009370 | Counting or indicating ring device A counting or indicating ring device has indicating rings which are respectively provided with numerals or marks on a pitch circle thereof and are supported by a shaft, step advancing means spaced adjacent to one of the indicating rings to advance it step... | 02/22/1977 |
