| |
| | SS-62 O-1 |
 | | The harbor defense requirements of the "N" class were withdrawn; requirements were for 14 knots surface speed, radius of 3,150nm at 11 knots. |
 | | Early submarine classes such as E, H, K, L, M, N, O, and R, known as "pig boats" or "boats" because of their unusual hull shape and foul living conditions, ranged in displacement from 287 to 510 tons. |
 | | Boats of the N and O classes, as well as some of the E type, patrolled American coasts and harbors in a defensive role. |
| www.globalsecurity.org /military/systems/ship/ss-62.htm (381 words) |
|