. Digest of United States automobile patents from 1789 to July 1, 1899, including all patents officially classed as traction-engines for the same period. Chronologically arranged ... together with lists of patents in the classes of portable-engines, traction-wheels, electric locomotivs, and electric railway battery systems ... . -:;^<i2£i.^«», ^x^-^AiS- ^ • ^ Improvement in Traction-Engines. No. 127,507. atented June 4, 1872. , Fig. 2. 0 A. OLMSTED. 3 l. Improvement in Traction-Engines. No, 127,507 Patented June 4, 1872- WITNESSES. INVENTOR.

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