{HEAD ~ The error signal} from {TAIL ~ summer} 82 affects the constant speed drive 66 of each channel in an identical manner 
{ HEAD ~ The error signal } from { TAIL ~ summer } 82 affects the constant speed drive 66 of each channel in an identical manner
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH