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An ore-bulk-oil carrier, also known as combination carrier or OBO, is a ship designed to be capable of carrying wet or dry cargoes. The idea is to reduce the number of empty voyages, in which large ships only carry a cargo one way and return empty for another. These are a feature of the larger bulk trades.

The Russian word for "ore-bulk-oil carrier", nefterudovoz , in combination with a number, is often used as a proper name for a ship, e.g. Nefterudovoz-51M.

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