... AND CHECKS BEFORE CLOSING TIME1972; ELECTR. REV.; G.B.; DA. 1972; VOL. 191; NO 18; PP. 595-596Serial Issue

MODULAR EHV POWER CIRCUIT BREAKERS SIMPLIFY INSTALLATION WHILE RETAINING PROVEN RELIABILITY1973; WESTINGHOUSE ENGR; U.S.A.; DA. 1973; VOL. 33; NO 4; PP. 112-118; BIBL. 3 REF.Serial Issue

SF₆ SWITCHGEAR FOR OUTDOOR AND INDOOR SWITCHING STATIONSKESSLER C.1973; PHILOS. TRANS. R. SOC. LONDON; G.B.; DA. 1973; VOL. 275; NO 1248; PP. 109-120; BIBL. 19 REF.Serial Issue