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Nakajima provided Japan with its first large radials by building licensed Bristols beginning in the late 1920s, and Gnome-Rhone engines beginning in 1936. Nakajima built three 14-cylinder radial engines. The pre-World War II Mamoru possibly shares characteristics with the Pratt & Whitney R-2000. It was the most powerful 14-cylinder engine ever built, with versions at 1,790 kW (2,400 hp) and one of
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