| http://www.w3.org/ns/prov#value | - An apparatus, for indicating the position of a body part, comprising:a sensor for sensing a direction and angle of tilt, said sensor including a plurality of ON/OFF switches, each switch, at any one time, having either an ON or an OFF state, said ON and OFF states responsive to tilting of said sensor; means for mounting said sensor on the body part; means for sampling said ON and OFF states of sai
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