Type X (XB) U-boats were a special type of German submarine (U-boat). Although intended as long-range mine-layers, they were later used as long-range cargo transports, a task they shared with the Type IXD and Italian Romolo-class submarines.
^Gröner 1991, pp. 76–77.
^Campbell, John Naval Weapons of World War Two ISBN 0-87021-459-4 pp.248&249
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