{HEAD ~ A tracer control system} 1 wherein {TAIL ~ said range} is circular and said data stored in said memory for determining the limits of the selected tracing are coordinate values along said machine axes of the center of the circular range and a radius therefrom 
{ HEAD ~ A tracer control system } 1 wherein { TAIL ~ said range } is circular and said data stored in said memory for determining the limits of the selected tracing are coordinate values along said machine axes of the center of the circular range and a radius therefrom
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