Specification for mining type flameproof gate-end boxes, Gate-end boxes with air-break circuit-breakers (for use on 3-phase a.c. circuits up to 650 volts)— 22 стр.
Specification for mining type flameproof gate-end boxes, Gate-end boxes for direct-on-line motor starting (for use on 3-phase a.c. circuits up to 650 V)— 22 стр.