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According to the Maintenance Expendable limits manual, Libby made some similar machines that are covered in TM 5-3431-205-20P (LE-300, LEW300, and LEB300), for a diesel one the TM is 5-3431-201-20P (ODW-300).
Closest I can find is TM 5-3431-228-34P for the
WELDING MACHINE, ARC:
AC/DC, 300AMP TRANSFORMER RECTIFIER;
CONSTANT CURRENT, BASE MOUNTED
(EUTECTIC CORP. MODEL MD301 FED)