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2 449,425 3. The rub- roller herein described and In testimony whereof I affix my signature in shown, consisting of the bearings having the presence of two witnesses. triangular rib, the body A, provided with the GEO. A. NELSON. longitudinal slot, the roller having the en- 5 larged ends loosely mounted between the ex- Witnesses: tended ends of the bearings, substantially as A. C. TIMS, set forth. J. W. KNIGHT.