{HEAD ~ an elongated hopper door} extending across the full width of the box along the bottom of {TAIL ~ the hopper} to form a part of the bottom thereof 
{ HEAD ~ an elongated hopper door } extending across the full width of the box along the bottom of { TAIL ~ the hopper } to form a part of the bottom thereof
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH