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2 1,054,091 roof seam, a slotted plank-supporting arm, In testimony whereof I have hereunto an abutment on one side of the slot, a cam subscribed my name. lever on the opposite side thereof adapted to B. P. DARNALL. press the seam against the abutment and an 6 arched brace secured to the plank-support- Witnesses: ing arm and adapted to rest on the roof and B. A. GREATI-oUSE, thus steady the jack. E. P. LIPSCOMB. Copies of this patent may be obtained for five cents each, by addressing the " Commissioner of Patents. Washington, D. C."