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????? ??? ????? ?? ??????? continuous ?? get ? leading to wear and tear ? necessity ?? repair and maintenance. ?? ????? .taking ???? ? ????? ????? ??? ????? ? ?? ?????? ?? durability ????? ?? add to. repair ??????? should ?? ??? carried out ??? ??????? ? ??????? ????? ??? ??? ???

????? ??? ?????/??? ???/??? ????? ?? ??? ????/?????/???? ?? ???????/???????/????? ???? ??????? ???? ????????. ?? ???/?? ???/?? ???? ?? ??? ????/?????/???? ????/????/???? ???? ?? ????/??? ?????/??? ??? ?? ?????/????/????? ???? ?? ??????/??????/????? ?? ????? ????/????? ????/?????? ????. ?????/?????