| http://www.w3.org/ns/prov#value | - Apparatus for generating signals representing the co-ordinates of a point including a sheet of electrically resistive material held in tension across, and adjacent to, but not in contact with, the smooth surface of an electrically resistive member, the sheet being of such material and/or so mounted that it is able to make contact temporarily with the said surface of the resistive member over a rel
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