Memory Protection Devices, Inc. (MPD) ? ????????? ????????? ? ??????? ?????? ?????? ???????? Battery Holders. ????? ????????? ?????? ???????? ?????????? ????? ????????????? ? ?????? ?????????? ??????? ??? ?? ??????????. ????? ????, ???? ????? ???????? ????????? ?????? ????????? ??????? ?? ???? ?????????????? ???????, ?????????? ???????????? ???????, ? ????? ?????? ?????????. ?????? ?????? ???????? ?????????? ? ???, ??? ????? ???????? ???? ????????? ??????? ?????, ??? ?????-???? ??????, ? ?????? ?????????? ??????????? ..