The second input transducer is oriented in {HEAD ~ the opposite direction} from {TAIL ~ the first input transducer} 
from
The second input transducer is oriented in { HEAD ~ the opposite direction } from { TAIL ~ the first input transducer }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL