<P> From 1940 , Rolls - Royce participated in the development of the jet engine and built for itself , and retains , a pre-eminent position in aero engine development and manufacture for use in defence and civil aircraft . </P>
<P> From 1940 , Rolls - Royce participated in the development of the jet engine and built for itself , and retains , a pre-eminent position in aero engine development and manufacture for use in defence and civil aircraft . </P>
when did rolls royce start making jet engines
when did rolls royce start making jet engines
1940
1940