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continued, scores of American and Canadian students were trained, and the firm produced several new types of military aircraft, both experimentally and in production. These included trainers, pursuit, and single seater scout planes with rotary engines. Best known, the Model S-4, or "Tommy" as it was popularly known, was produced in considerable quantities and in several succeeding model developments. Facilities were expanded, a portion of the Morse Chain Company plant was utilized and the former Thomas work force of about 100 grew to over 1,200 employees.

After the initial development of the Liberty engine, the Thomas engine venture was dropped and full efforts were applied to aircraft only. As soon as a Liberty engine was available the firm built an experimental high wing pursuit monoplane known as the MB-1 which was not successful, however, it started the Thomas-Morse MB series which followed, with Hispano and Curtiss D-12 engines. The MB-3 model with Hispano engine was a highly successful plane and was ordered in quantities by the Air Service. It developed into one of the fastest and most notable American pursuit planes of the post World War 1 era. Unfortunately for Thomas-Morse, when this MB-3 type was advertised by the Army Air Service on open bids, Boeing won the contract to manufacture them in quantity.

Although he never became an active pilot, until 1918 William continued to fly on occasion, accompanied by one of the test pilots, Evidently Oliver did no flying and confined his activities to engineering and administrative duties.

After the end of World War 1 the production of military aircraft was quickly brought to a standstill by a general cancellation of Government orders and the only work remaining was the authority to complete planes then under construction, and make spare parts. Ralph Brown left to go with Old Town Canoe Company in 1919, then during the ensuing post war period Thomas-Morse did factory conversion of Government owned DeHavilland-4 airplanes, built an experimental airmail

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