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There have been various principles for the inch previously, with the current definition being founded on the global yard. Perhaps the soonest meaning of the inch depended on barleycorns, where an inch was equivalent to the length of three grains of dry, round grain set start to finish. One more form of the inch is likewise accepted to have been gotten from the width of a human thumb, where the length was acquired from averaging the width of three thumbs: a little, a medium, and a huge one. дюймы в см