| http://www.w3.org/ns/prov#value | - ng information of a first mixed value obtained by a means for mixing the error value with one or more of said stored values which are at least an interval of L renewing cycle periods older, where L is an integer at least equal to 2; and an output means for producing the control signal from a second mixed value obtained by a means for mixing the error value with one or more of said plurality of sto
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