Terms for subject Mathematics containing prior to

English	Russian
just prior to	непосредственно перед
prior to	до того, как
prior to	прежде чем (or before, or previous to + герундий)
prior to being	до того, как
prior to 1943, heavy water was produced by electrolysis of water	до ... года
prior to the seventeenth century	до семнадцатого столетия
several experiments were performed prior to and during the launch of Apollo	до