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<br />inure safe,. :.11 ~irzas and 1Ci11 holes tl~t are aot
<br />i-: s:; arc ccver~d. ;-•lacls^ith Shcp at ?ortal ; of h'ain
<br />ei ic; a ,;,,oven fras~ bsildin5 and nnoR sheds fron por-
<br />tal ., °AC O'_~ ..4S t° Gllr~D ab O:lt 50u^ feet
<br />1.0!':x:,.
<br />°'.:° :.r.:•:el i:; rrovider Irit ; sn. 'icier.L doors to prevent
<br />a:...._. :.~.-._ _: .:c,a ~a~ f;.r=:. or gases .•GL Sa
<br />id b~,rildin~s
<br />.o:.__ rir.. occur,
<br />T _ I _ S _ ~ _ I _ ~ _ _ TI U D S.
<br />_^e .:._,,.:o. ca ore e};tr•ac,.ion is cvar .:and stopin and
<br />~_ __ ...-~ ri;.. ~ir rr1.. ]-.n .~. ~ rills. l:ir.d of air drills
<br />4sed _as_-'s Ir .sc11
<br />I ersoll =^;; Th;.
<br />.!'-'=.'.0;? Of ti':LC1'in~ ~[, ctnlla anC square meets coverer tcith
<br />i2~'l.a,. "T.c :-lV:G 1r,i 4^y i A
<br />_ n_r.., ar.G spr;rce pr~parad b~
<br />-• -- _ 4_ _ ;a.;lcient tc secur,. .,af==+ d
<br />-~~'• IIn _r~round tra:-,:-
<br />- _ 1-' =~.-:^ ..ar.d am_: el~~tric Iroters. .,tee1 Cars are
<br />..: _. ~ :^O.• ~1 u .;nlrl;_ • _i..r LC;j I'! 1
<br />caueU t, `:ara and gravit•~.,
<br />- ~.-~~ - i_. .~ t•rral t'rlrrnlgh Tunnels.
<br />...~ _.. _7 .. ..4., fC's =r._t::. ._~,;='. 1CV~'1 ;_7 .r4 lc;VCl CrO3::Cllt
<br />. -. - lsvel :,rc? :,ir T:aise
<br />-, .`~6 ft.
<br />- - . _...- _ . -r. - _.._ ne :~:- -'~c~ ~.,. . 1.1 ti;-co fcr c ~ylc~+c
<br />~lco._;cit, -':ri •_.-INS ,rr- u:;~ ^ph 1• ;.
<br />.• f ~ i,Y:Lin~; under•;,roar;d.
<br />^:ore , fr•o^': arder~rounfl an ca the
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<br />..+ ~ tGr15, ~VUra~G' t7:,lld~*C pCt'
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<br />,. ~t~l ra1T.i C: of feCa in '^~
<br />:nncls 2VOn,
<br /> _ :.rif u un;. l~:v;l., 1G0 C!'0,
<br /> In Cr'OS3 C'1t wGrj'+,
<br /> - .:in~:c~ ,nc r•ai:;::., 3000.
<br />Total aar.b~~_• ~f t'o::t is ac`•,:'! ~ ~-aaert 1v,+30O.
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<br />~.: ,ivr,rl µ„ it i;; under new rlaraSe-
<br /> ~~ot. Avera~+. r:^~„ per Isonth j150.
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