similar to that of upper and lower panels 26 28 as seen in fig2 and 4 by cooperation of the hinge 30 lid hinge 48 and back panel hinge 52 upper and lower panels 26 28 are easily removed from the work area when the upper cabinet 12 is fully open to hold lid 46 in its fully opened position two pneumatic controls 54 are provided one end of pneumatic control 54 is attached to lid 46 the other end of the pneumatic control is attached to the front of the shelf 56 shelf 56 is in turn fixedly attached to back panel 50 such that shelf 56 thereby provides a stationary support for the pneumatic control 54 two shelves 56 are provided shelves 56 decline from back panel 50 toward the user at about a 25 u00b0 angle the upper cabinet 12 has a base consisting of an upper base portion 58 and a lower base portion 60 the lower base portion 60 is of tubular steel construction the tubular steel has a square cross section the tubes of lower base portion 60 are welded in a u shape with arms of equal length perpendicular to the cross piece the cross piece is of substantially the same linear dimension as the bottom edge of the inner face of back panel 50 the arms are each of substantially the same linear dimension as the bottom edge of side panels 62 the ends of the arms of lower portion of base 60 opposite the cross piece are welded to the bottom of back panel 50 perpendicular to the inner face of back panel 50 in this manner when lower base portion 60 sets on a horizontal surface back panel.