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| Number | Title | Issue Date |
| 7019672 | Position sensor A low cost x-y digitising system is described for use in consumer electronic devices, such as portable digital assistants, mobile telephones, web browsers and the like. The digitizer includes a resonant stylus, an excitation winding for energising the resonant stylu... | 03/28/2006 |
| 6788221 | Signal processing apparatus and method Processing circuitry is provided for processing signals received from, for example, sense coils forming part of a position encoder used to encode the relative positions of two relatively moveable members. The position encoder is such that each of the plurality of si... | 09/07/2004 |
| 4473810 | Device for measuring the current which flows in a conductor An a-c current sensor for measuring the current which flows in a conductor has an insulating frame having a central compartment open at its upper end and encompassed by a U-shaped receptacle for a bent portion of the conductor. A coil is housed in the cen... | 09/25/1984 |
