| http://www.w3.org/ns/prov#value | - a magnetic field generator (2, 15) coupled to object (1), which generates a locally and time-defined varying reference...http://www.google.com/patents/US20010009367?utm_source=gb-gplus-sharePatent US20010009367 - Sensor device to record speed and motion direction of an object, especially rotational speed and direction of a rotating objectAdvanced Patent SearchPublication numberUS20010009367 A1Pub
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