| BIPM |  |  | Bureau International des Poids et Mesures Organisation intergouvernementale |
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| CENAM |  |  | Centro Nacional de Metrologia Mexico, SIM |
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| CNR-IMGC |  |  | Consiglio Nazionale delle Ricerche - Istituto di Metrologia G. Colonnetti; from 1st January 2006: Istituto Nazionale di Ricerca Metrologica, INRIM Italy, EURAMET |
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| CSIRO-NML |  |  | Commonwealth Scientific and Industrial Research Organization - National Measurement Laboratory; from 1st July 2004: National Measurement Institute, Australia, NMIA Australia, APMP |
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| KRISS |  |  | Korea Research Institute of Standards and Science Korea, Republic of, APMP |
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| LNE-INM |  |  | Conservatoire national des arts et métiers / Institut National de Métrologie France, EURAMET |
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| NIM |  |  | National Institute of Metrology China, APMP |
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| NIST |  |  | National Institute of Standards and Technology United States, SIM |
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| NMIJ |  |  | National Metrology Institute of Japan Japan, APMP |
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| NMi-VSL |  |  | Nederlands Meetinstituut - Van Swinden Laboratorium; from 1st March 2009: VSL Netherlands, EURAMET |
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| NPL |  |  | National Physical Laboratory United Kingdom, EURAMET |
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| NRC |  |  | National Research Council Canada, SIM |
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| PTB |  |  | Physikalisch-Technische Bundesanstalt Germany, EURAMET |
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| SMU |  |  | Slovensky Metrologicky Ustav Slovakia, EURAMET |
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| VNIIM |  |  | D.I. Mendeleyev Institute for Metrology, Rostekhregulirovaniye of Russia Russian Federation, COOMET |
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