. 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 ... . UtlCjML, M. A. HALSTEADImprovement in Traction Engines. 2 ShDcts-bneet t. No. 119,138. ^ir- ^? PalentBd Sep. 19, 1871. M. A. HALSTEAD. ^Sh,e,, . Improvement in Traction Engines. No, .X^.J Patented Sep. 19,

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