| http://www.w3.org/ns/prov#value | - of the fundamental wave component at the zero point of the wave and producing signals indicative of the displacement of the code disk in proportion to the said phase shift; wherein said plurality of slit holes are grouped into pairs, each pair having a pitch corresponding to an integral multiple of said first pitch P with a shift of P/(4n+2), wherein n is a positive integer, and wherein each pair
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