22,633. Wilkinson, J., and Wilkinson, A. Dec. 12. Printing.-Relates to a printing-frame in which displacement of the back is prevented by pins on the back projecting into grooves in the frame. In the plan of the frame shown in Fig. 1, the hinge pin e<1> projects on each side of the hinged back b, and fits into vertical grooves in the sides a <x> of the frame. The grooves are preferably lined with sheet metal.