a means for {HEAD ~ control} that disallows an operation that would increase {TAIL ~ the work radius} if an overload state is detected by said means for comparison 
a means for { HEAD ~ control } that disallows an operation that would increase { TAIL ~ the work radius } if an overload state is detected by said means for comparison
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH