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The United States of America
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Metrology institutes
NIST** (National Institute of Standards and Technology)
CANNON* (Cannon Instrument Company of State College, Pennsylvania)
 
National legal metrology authorities
International Legal Metrology Group (ILMG/NIST)
 
National accreditation bodies
National Cooperation for Laboratory Accreditation (NACLA)
American Association for Laboratory Accreditation (A2LA)
American Council of Independent Laboratories (ACIL)
AOAC International
International Accreditation Service, Inc. (IAS)
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NCSL International
 
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ASTM International
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** Signatory of the CIPM MRA ; * Also participating in the CIPM MRA.

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