| http://www.w3.org/ns/prov#value | - Four way valves are schematically depicted at 294, 296, 298 and 300 in FIG. 14; and are respectively operably connected as indicated in the pressurized fluid supply conduits of double acting pneumatic drive motors 234, 242, 254 and 260; and to a standard, non-illustrated source of pressurized fluid, for example air, to control the respective operations of those drive motors.
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