The output side of the current meters are connected to {HEAD ~ a logic element} that is provided for combining the partial currents and which provides {TAIL ~ a logic signal} that is a function of their combination 
provides
The output side of the current meters are connected to { HEAD ~ a logic element } that is provided for combining the partial currents and which provides { TAIL ~ a logic signal } that is a function of their combination
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH