US Army, Technical Manual, TM 5-3431-203-15, WELDING MACHINE INERT GAS SHIELDED TRANSFORMER, 300 AMP, 10 TO 400 AMP, AC, STR POLARITY, 10 TO 300 AMP DC, ... MODEL M AC/DC T134) (FSN 3431-862-6670)
US Army, Technical Manual, TM 5-3431-203-15, WELDING MACHINE INERT GAS SHIELDED TRANSFORMER, 300 AMP, 10 TO 400 AMP, AC, STR POLARITY, 10 TO 300 AMP DC, REVERSE POLARITY (MIDSTATES MODEL M AC/DC T134) (FSN 3431-862-6670)