Assertion: kilogram | /r/HasAspect | seven at nist in gaithersburg
Facets:
value: around the world
type: LOCATION
value: at nist in gaithersburg
type: LOCATION
Source sentences:
text: it has many copies around the world — including seven at NIST in Gaithersburg — that are used to calibrate scales and make sure the whole world is on one system of measurement.