Assertion: r's value | /r/HasProperty | cited with standard uncertainty of 0.046%
Facets:
value: by 1969
type: TEMPORAL
Source sentences:
text: By 1969, the value recommended by the National Institute of Standards and Technology (NIST) was cited with a standard uncertainty of 0.046% (460 ppm), lowered to 0.012% (120 ppm) by 1986.