?? ?? ??????? ????? ?? ????? ?????? ?? {???????????? ???? ??? ??? ?? ?? ?????? ?????? ?? ?? ?????? ????? ?? ??? ?? ????? ???? ?? ???? ??? CHAIR FOR REPAIRING ????? ????? ???? A KEY TOOL ???? ?? ??? ?? ????? ?? ??? ??????? ??? . ????? ????? ???? A CHAIR WITH ADJUSTABLE HEIGHT? ?? ????? ??? ????? ?? GIVES ?? AT VARIOUS ANGLES WORK EASILY . CHAI