A major US rocket manufacturer says it may buy Russian engines for t' launch vehicle Taurus Two bein' developed for NASA. Aerojet is in talks over t' possible deal after successful lengthy tests o' t' Russian NK-33 engine. T' company bought t' same model in t' mid-90's and this time might need up t' 70. T' rocket engine is produced in Central Russia's Samara region and was first developed 40 years ago.