Matches in DBpedia 2016-04 for { ?s ?p "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 As an internationally recognized ship identifier, national official numbers have been superseded by the IMO ship identification number, though flag states still use national systems, which also cover those vessels not subject to the IMO regulations."@en }
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- Official_number abstract "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 As an internationally recognized ship identifier, national official numbers have been superseded by the IMO ship identification number, though flag states still use national systems, which also cover those vessels not subject to the IMO regulations.".
- Q7079596 abstract "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 As an internationally recognized ship identifier, national official numbers have been superseded by the IMO ship identification number, though flag states still use national systems, which also cover those vessels not subject to the IMO regulations.".