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ttp://www.microworks.net/pacific/aviation/r4d_gooneybird.htm

「R4D-6: The 157 DC-3A-467's were ordered by the USAAF as C-47B-DLs and transferred to the USN
between August 1944 and March 1945. These aircraft, built at the Long Beach, California plant, were identical
to the R4D-5 but were equipped with two 1,200 hp Pratt & Whitney R-1830-90C engines with
two-stage, two-speed superchargers, provisions for fuel tanks in the fuselage and improved heaters.」