00588nam a2200193Ia 4500 IN-BaIIA 211028s9999 xx 000 0 eng d IIA Library 621.385.1 MUL Mullard Electronic Products 2257 Valve and service reference manual Mullard Electronic Products Limited London Mullard Electronic Products 1949 221p. NASA Thesaurus Radio Electronics 2258 Radio Engineering 1656 Valves 2259 BK 1049 1049 0 0 0 0 BAN KAV GEN 0000-00-00 0 621.385.1/ MUL 1097 2021-11-05 0000-00-00 BK