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Among the earliest length measures was the foot, which varied
from place to place There were two common sizes for a "foot" - the foot of 246
to 252 mm based on a man's bare foot - the foot of 330 to 335 mm based on two
hand measurements. The first calibrated foot ruler was invented in 1675 by an
unknown inventor.
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Weights and measures were among the earliest tools invented by
man. Primitive societies needed rudimentary measures for many tasks:
constructing dwellings of an appropriate size and shape, fashioning clothing,
or bartering food or raw materials.
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