| http://www.w3.org/ns/prov#value | - The system of claim 8, further comprising a source of hydraulic fluid under pressure, the implement having a support frame and a tool movable with respect to the frame, wherein:the at least one parameter is the position of the tool with respect to the frame; the at least one actuator means is a hydraulic cylinder, the hydraulic cylinder having a first end coupled to the frame and a second end coup
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