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