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1 <br />1 <br />T <br />1 <br />1 <br />1 <br />0 <br />1° <br />0 <br />a <br />1 <br />1, <br />i <br />1 <br />r <br />f-200 <br />_.~_ <br />PILLAR EXTRACTION <br />50 DURING RETREAT <br />I <br />f <br />-~ <br />500 --. ~ 500 <br />200 -- <br />200 <br />2~ ~0~ 20 , <br />20~_' <br />20. ^^^^^^^i=i^ i^i~i_^ <br />^^^^^^^'^^^^ ~^i^^ <br />'^^^!^^^^;I ^^^~ '~ <br />^^ ~ '~ ^ <br />~i~ i^ ^^' <br /> <br /> <br />^ ^l^I~^ ^ ^i^^~ ^^^^ ^ <br />^ I^^^^ ^ ^;^^ 1^^^^ ^ <br />^- ^^^^ ^ ^;^ ^^ ~n~ ^ <br /> <br /> °~^ , <br /> 200 , ^^ <br /> t ~ ^~^ <br /> _________ Conveyor Belt <br /> Dimensions in feet <br />Scale 1 inch = 200 feet <br />FIGURE 4-2 A Typical Room-and-Pillar Panel <br /> <br />