. . "USS R-20 (SS-97)"@en . "USS R-20, possibly in the Thames River near New London, Connecticut, sometime between April and June 1941."@en . . . . "USS R-20 (SS-97) was an R-class coastal and harbor defense submarine of the United States Navy. Her keel was laid down on 4 June 1917 by the Union Iron Works in San Francisco, California. She was launched on 21 January 1918 sponsored by Mrs. Arnold Foster, and commissioned on 26 October 1918 with Lieutenant Commander Alfred E. Montgomery in command."@en . "300"^^ . "--08-29"^^ . "--01-22"^^ . . . . . . . . . "USS R-20 (SS-97) was an R-class coastal and harbor defense submarine of the United States Navy. Her keel was laid down on 4 June 1917 by the Union Iron Works in San Francisco, California. She was launched on 21 January 1918 sponsored by Mrs. Arnold Foster, and commissioned on 26 October 1918 with Lieutenant Commander Alfred E. Montgomery in command."@en . . . .