???? ??????? F53: ?????? ????? ?????? ???? ???????? ??????? ?????? ??

???? ??? ???? ??????? F53 ?? ???? Shijiazhuang Deye Piping Industries Co., Ltd.? ??????? ?????? ????????? ??????? ????????? ???????? ?????????. ???? ??????? F53 ????? ??? ????? ?? ??????? ??????? ????? F53 ???? ?????? ???????? ???????? ???????? ?????? ????? ???????? ???? ??????? ??? ????? ??????? ????? ?? ???? ???????? ??? ?? ??? ????? ????? ?????? ?????? ??????? ????????. ??? ????? ?????? ????? ????? ?? ??? ???? ???? ???? ?????? ????? ?? ?????? ???????? ??????? ?????? ???? ??????? F53 ?????? ?????? ???????? ?????? ??? ????? ???? ????? ??????????? ?????? ???????? ????????. ??????? ??????? ???????? ???? ?????? ?????? ?????? ?????? ?????? ?? ??? ??????? ????????? ?? Shijiazhuang Deye Piping Industries Co., Ltd.? ??? ??????? ?????? ?????? ???????? ????? ?????? ????????. ?? ???? ??????? F53 ????? ???? ????? ?????? ?? ???? ?????? ????????? ?????? ??????? ??????? ?? ???????.