| http://www.w3.org/ns/prov#value | - 7/298935International Classification: G01C 1708U.S. Classification: 33333Abstract: A unit comprising a base on which is mounted an atlas of maps each with an arrow thereon indicating the relation of the map area to north, and on which base is also mounted a compass having in a container a liquid on which floats a magnet bearing disk on the surface of which disk is a visible pointer pointing in the
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