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| Number | Title | Issue Date |
| 4357672 | Distance ranging apparatus and method The disclosure is directed to a microprocessor-based apparatus and method for determining the distance between an object and a reference position. An embodiment of a graphical digitizer is set forth in which a microprocessor system is adapted to generate ... | 11/02/1982 |
| 4151596 | Calculator interface The invention is applicable for use in conjunction with hand-held calculators, preferably of the type having a substantial computing and programming capability. The calculator typically has a housing, an input keyboard on the housing, a computing module i... | 04/24/1979 |
| 4124838 | Apparatus for position determination The disclosure is directed to an apparatus for position determination in a data space, the position determination preferably being in the form of rectangular coordinates. First and second orthogonally oriented elongated microphones are provided. The micro... | 11/07/1978 |
| 4012588 | Position determining apparatus and transducer therefor An apparatus for determining the position of a movable element or stylus which is movable in a data space. In accordance with the invention there are provided first and second spaced receivers, each receiver comprising a hollow shell of piezoelectric mate... | 03/15/1977 |
