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SI Units – Length by National Institute of Standards and Technology
Codex
(
@codex,
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Physics
Physics bibliography
Metrology bibliography
2026-11-05
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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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Metrology bibliography
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