| http://www.w3.org/ns/prov#value | - A high resolution angular position monitor for a slowly rotating body for producing an electrical pulse after each S60/N degrees of rotation of said body, where N is an integer, said monitor comprising: means directly connected to said body for rotation at the same speed as said body about the same rotational axis, said means havin-g an opaque surface normal to said axis, and said surface having a
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