Ro-3 (other)
Ro-3 may refer to: * , an Imperial Japanese Navy submarine in commissioned in 1922 and stricken in 1932 * Type F submarine, an Imperial Japanese Navy submarine class whose F2 subclass sometimes is called the ''Ro-3'' class See also * R03 (other) R03 may refer to: * AAA battery * Alkali Lake State Airport in Lake County, Oregon * ATC code R03, a subgroup of the Anatomical Therapeutic Chemical Classification System See also * * * * * ''R3.0'' (album), a 2017 album by Regine Velasqu ...

Type F Submarine
The were medium Imperial Japanese Navy submarines in commission during the 1920s. They were Japan's first true seagoing submarines and the earliest Japanese submarines classified as "second-class" or "medium" submarines. Design and description The Type F submarines were designed by the Italy, Italian firm Fiat-Laurenti and built under license by Kawasaki Heavy Industries, Kawasaki at Kobe, Japan.Gray, p. 247. The Type F submarines were the Imperial Japanese Navy′s first true seagoing submarines, and when the Japanese adopted a three-tiered classification system of its submarines as first-class (''I (kana), I''), second-class or medium (''Ro (kana), Ro''), and third-class (''Ha (kana), Ha'') on 1 November 1924,Gray, p. 245. the Type F submarines were the earliest to receive the second-class classification, as reflected in their low numbers in the ''Ro'' series, and in fact they were the earliest Japanese submarine classified as anything higher than third-class. As built, Type F ...
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