????? ????? ??? ?? ????? ???? ????? ?? ???? ??? ???. ?? ??????? ???? ????? ?? ???? ??? ???? ???? ???? ? ?? ????? ???? ???? ????. ???/?? ??? ???/?? ??? ?????, ???? ? ????? ????? ????? ?? ????? ?? ??? ?? ????? ?? ???? ????. ?? ??????? ?????/ ???? | ????? ?? ???? ?? ???? ????? ?? ????? ? ?? ????? ?????

????? ??? ????? because of ??????? ?????? ?? become ? ?? ???? ?? wear and tear ? requirement ?? repair and maintenance. ?? ????? .carrying out repair and maintenance ????? ??? ????? ? ?? are able to ?? lifespan ????? ?? ?????? . restoration ??????? ought to ?? ??? ????? ??? ???????

??? ?? ?????? ????? ?? ???? ?????? ????? ? ??????? ????? ?? ????. ????? ?? ?? ???? ??????? ????? ??????? ????? ?? ????. ?? ????? ????? ?? ?? ???? ???? ???? ?? ???? ??? ? ??? ???? ?????? ???. ????? ????? ?? ?? ???? ?????? ????? ? ?????? ??????? ????? ?? ???. ?????? ????? ?? ????? ???? ?? ???? ???