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(4) D'ainneoin ghinearáltacht an Rialacháin seo, féadfaidh comhlacht poiblí comharthaí a chur in airde ar comharthaí iad atá de réir Chóras Idirnáisiúnta na nAonad arna ghlacadh ag an Bureau Internationale des poids et mesures, arna bhunú leis an Metre Convention a síníodh i bPáras sa bhliain 1875.
(4) Notwithstanding the generality of this Regulation, a public body may erect signs that are in compliance with the International System of Units as adopted by the Bureau Internationale des poids et mesures, established by the Metre Convention signed at Paris in 1875.