The plates forming {HEAD ~ contact surfaces} 2 are intermediately supported by {TAIL ~ the intermediate weir} 13 within slots formed in the intermediate weir 
The plates forming { HEAD ~ contact surfaces } 2 are intermediately supported by { TAIL ~ the intermediate weir } 13 within slots formed in the intermediate weir
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH