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of the ruler were subsequently presented to the United States, which in turn adopted the measure for the United States national standard yard.

In 1866, the U.S. Congress passed a law that allowed, but did not require, the use of the metric system in trade and commerce. Included in the law was a table of conversion factors between the customary (i.e. English-derived) and metric units, among them a definition of the meter in terms of the yard, and the kilogram in terms of the pound. In 1893, the Mendenhall Order

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