| http://www.w3.org/ns/prov#value | - Nozzles may be configured to produce rotation of the cutting head 2087 about the cutting head rotational axis AR. In one example, the nozzle extends outwardly from the cutting head outer surface at a radial angle from the cutting head rotational axis AR, the angle may be preselected such as for example to maximize rotational force imparted onto the cutting head by the fluid exiting the nozzle.
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