E
SECTION E — FIXED CONSTRUCTIONS
EARTH DRILLING
;
MINING
E21
MINING
E21B
DEEP DRILLING
;
OBTAINING OIL, GAS, WATER OR SOLUBLE MATERIALS FROM DEEP WELLS
E21C
MACHINERY FOR, OR METHODS OF, MINING OR QUARRYING
E21D
SHAFTS
;
GALLERIES
;
TUNNELS
;
LININGS THEREFOR
E21F
SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINAGE IN OR OF MINES OR TUNNELS
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