| http://www.w3.org/ns/prov#value | - ddition, a regulating mechanism, not shown but associated with the machining etchant delivery system 109, may be provided to deliver the machining etchant to all or selected nozzles, or to either or both of the orifices of a dual nozzle, in such a manner as to cause the pressure and/or flow rate delivered by the nozzle or orifice to vary while in operation, either continuously or in pulsed fashion
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