E
SECTION E — FIXED CONSTRUCTIONS
BUILDING
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
;
SINKING SHAFTS
;
GALLERIES
;
LINING GALLERIES
E21F
VENTILATION
;
SAFETY DEVICES
;
TRANSPORT
;
FILLING UP
;
RESCUE