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The U B'g were of various sizes, mostly small, and some of them were built in sections for transportation by rail. The U boats proper, which constituted the largest and most important class, had a speed of about 16 knots on the surface and 9 knots submerged, and could remain at sea for a period of 5 or 6 weeks, the duration of the cruise depending chiefly upon the supply of torpedoes.
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