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official number
Official numbers are ship identifier numbers assigned to merchant ships by their country of registration. Each country developed its own official numbering system, some on a national and some on a port-by-port basis, and the formats have sometimes changed over time. As an internationally recognized ship identifier, national official numbers have been superseded by the IMO ship identification number, though flag states still use national systems, which also cover those vessels not subject to the IMO regulations.
==British Official Number==
Beginning in 1855, with the implementation of the Merchant Shipping Act 1854, all British seagoing vessels were assigned an official number to give each ship a unique identity, even after being renamed or changing the port of registry.〔Merchant Shipping Act 1854〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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