{HEAD ~ A tracer control system} 1 wherein 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 {TAIL ~ the circular range} and a radius therefrom 
{ HEAD ~ A tracer control system } 1 wherein 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 { TAIL ~ the circular range } and a radius therefrom
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH