72070824
Apr 3, 1959
Apr 12, 1960
MACHINE TOOL CONTROL SYSTEMS; COMPONENTS FOR MACHINE TOOL CONTROL SYSTEMS INCLUDING HYDRAULIC TRACER VALVES, HYDRAULIC POWER UNITS, HYDRAULIC MOTORS, HYDRAULIC PISTON-CYLINDER ASSEMBLIES, AND PNEUMATIC VALVES; CONTOUR COPYING MACHINE TOOLS; AND MACHINE TOOLS CONVERTED TO CONTOUR COPYING MACHINE TOOLS
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