 SI Units – Length by National Institute of Standards and Technology (source code)

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= SI Units – Length by National Institute of Standards and Technology
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https://www.nist.gov/pml/owm/si-units-length

Institutional metrology documentation. FAQ, “When did the metric redefinition of the inch occur?”: exact 25.4 mm conversion, derivation from the yard and the 1959 United States effective date.

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