Robert Wetherill & Company.

The firm of Robert Wetherill & Company was formed on January 1, 1872, by the brothers Robert and Richard Wetherill. The firm established a factory at 6th and Upland Streets in Chester, Pa., and specialized in the manufacture of Corliss-type stationary steam engines, offering complete factory power installations, including boilers, engines, shafting, pulleys and mill gearing. When the Sun Shipbuilding and Dry Dock Company was founded during the first phase of World War I, it purchased the Wetherill Company in July 1916 and converted it into a facility for the manufacture of marine engines.

From the description of Letterpress copybooks, 1882-1916. (Hagley Museum & Library). WorldCat record id: 122516287