?? ?? ?????? ????? ?? ????? ??????? ?? {??????????????? ?? ?? ?? ??? ?? ?? ?????? ?????? ?? ?? ?????? ????? ?? ??? ?? ????? ???? ?? ???? ??? CHAIR FOR REPAIRING ????? ????? ???? A KEY TOOL ???? ?? ??? ?? IS INVOLVED IN REPAIR WORKS. ????? ????? ???? ADJUSTABLE HEIGHT CHAIR ? ?? ????? ??? ????? ?