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2 498,242 a perforation to, receive a coupling pin and the lever with: the upper slide, substantially the latter being adapted to be engaged by a as described. link, a lever fulcrumed intermediate of its In testimony that I claim the foregoing as ends and having its ends connected with the my own I have hereto affixed my signature in 5 slide to cause the same to move simultane- the presence of two witnesses. ously, a spring for holding the lower slide at: the front of the draw-head and the upper MIDDLETON CUNDIFF. slide at the back thereof, a lever having its Witnesses: lower end fulecrumed on the draw-head, and E. B. PROCTOR, io a bolt arranged in said slot and connecting T. W. HARRISON.