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The reliability of the international measurement system depends on continued effort by each National Metrology Institute (NMI) to base its measurements and measurement uncertainties on universally accepted units, usually those of the SI, and to compare its measurements with those of other NMIs to establish their mutual equivalence. MSS, as Canada's NMI, participates regularly in measurement comparisons with other NMIs. In many cases these are multilateral comparisons coordinated by the Bureau International des Poids et Mesures (BIPM) and other bodies such as SIM or NORAMET, but bilateral comparisons are also undertaken.
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