{HEAD ~ a plurality} of {TAIL ~ secondary hopper door members} slidably mounted in side by side relation and parallel with said hopper door for selectively closing off a portion of the discharge slot formed when said hopper door is open 
{ HEAD ~ a plurality } of { TAIL ~ secondary hopper door members } slidably mounted in side by side relation and parallel with said hopper door for selectively closing off a portion of the discharge slot formed when said hopper door is open
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH