?? ?? ?????? ????? ?? ????? ??????????? {???????????? ???? ??? ??? ?? ?? ?????? ????? ?? ?? ??????? ????? ?? ??? ?? ????? ???? ?? ???? ??? ????? ????? ???? ????? ????? ???? ?? ????? ????? ???? ?? ??? ?? IS INVOLVED IN REPAIR WORKS. ????? ????? ???? A CHAIR WITH ADJUSTABLE HEIGHT? ?? ????? ??? ???