Domestic engineering
???????? ?? ??????? ?? ?????? ?????? ???????? ????????? ???????? ???? ?????? ???? ???? ?? ??????? ?????? ?? ???? ?? 30 ?????? ???????? ??????? ????? ?? 70 ????? ???????? ?? ??????. ????? ?? ???? ????????? ???????? ?????? ?????? ?????? ??????????? ????????? ????? ??????? ????????? ????? ??????? ??????? ?????? ????? ????? ????? ??????? ?????????? ?? ????? ??????????? ????? ?????? ????? ???????? ???? ????? ??? ???????? ??????? ???????? ?????? ?? ???????? ?????? ???????? ????????.