TC7/SC1 Measuring instruments for length

UNITED STATES

Dr Charles D. EHRLICH

• Group Leader, International Legal Metrology Group (Retired)
• National Institute of Standards and Technology (NIST)
• Weights and Measures Division
• 100 Bureau Drive, M/S 2600
• Gaithersburg
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Dr Michael NELSON

• Scientist in the NIST Office of Weights and Measures
• National Institute of Standards and Technology (NIST)
• Weights and Measures Division
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