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==Convenient numbers== {{Main|Convenient numbers}} In the 1970s the [[National Bureau of Standards]] (NBS) defined a set of convenient numbers to ease [[metrication in the United States]]. This system of metric values was described as [[#1β2β5 series|1β2β5 series]] in reverse, with assigned preferences for those numbers which are multiples of 5, 2, and 1 (plus their powers of 10), excluding linear dimensions above 100 mm.<ref name="GOVPUB-C13"/>
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