... and the research and development;avalanche thyristors;(TL371-250,TL371-320)phase control thyristor;(T212-10,T222-20,T232-20,T242 ... -50,T151-100,T161-160.T271-320,T123-160*,T223-200*,T123-500,T133-250*,T233-400 ... )rectifier diodes;(D212-10,D222-32,D222-40,D232-50 D161,D171,D123,D343,D243 and so on)adalanche rectifier diodes ...