| http://www.w3.org/ns/prov#value | - ns having first and second input leads; first switch means alternately connecting said first and second input leads from said first and second output leads, respectively, and vice versa, at a first rate to produce a third output signal of a frequency fo, where fo =Kfd and K is a constant, said difference means having a third output lead which carries said third output signal; utilization means con
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