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Artist's rendition of Elijah J. McCoy, Charles G. Wiard and George G. Roby's 1874 IMPROVEMENTS ON LUBRICATORS FOR STEAM ENGINES
"Improvements on Lubricators for Steam Engines." Patent no. 3499, filed by Elijah J. McCoy, Charles G. Wiard and George G. Roby, 1874
Source: Library and Archives Canada
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