I give a short personal view on what are National Measurements Institutes. More info can be found here:
https://en.wikipedia.org/wiki/International_Bureau_of_Weights_and_Measures
https://en.wikipedia.org/wiki/National_Physical_Laboratory_%28United_Kingdom%29
https://en.wikipedia.org/wiki/Physikalisch-Technische_Bundesanstalt
https://en.wikipedia.org/wiki/National_Institute_of_Standards_and_Technology
One thing not mentioned but related is ISO:
https://en.wikipedia.org/wiki/International_Organization_for_Standardization
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