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In Milan, Italy, 17ᵗʰ – 19ᵗʰ centuries, a small unit of length. As 1/10,368th of a trabucco, it was about 252 micrometers. As 1/1728 of the baraccio, it was about 344 micrometers. 
In the metrication effort of 1803 “atomo” was adopted as the name of the millimeter in Milan.
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Last revised: 1 December 2012.