Part Number: 1543E (20-qfn) Part Number: 1543F (Resistor fixed film) Part Number: 1543G (Valve) Part Number: 1543GL (Receptacle) Part Number: 1543H (Valve safety) Part Number: 1543HF-2SP (No description) Part Number: 1543IDW (Ne) Part Number: 1543IDW-TI (Ne) Part Number: 1543IG (Ne) Part Number: 1543IN (Ne) Part Number: 1543J (Uni) Part Number: 1543J4 (Motor) Part Number: 1543J883B (Component) Part Number: 1543J883BC (Unitrod)