Terms for subject Mathematics containing Design Engineering

English	Russian
many years will elapse before the theory is developed to the point where it is useful in engineering design	доводить теорию до уровня
the theory had to be developed to the point where it was useful in engineering design	доводить теорию до уровня
the theory has to be developed to the point where it is useful in engineering design	доводить теорию до уровня