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1 gen 1870 anni - 1870 Wilmot diseñó un micrómetro que medía milésimas. J.R. Brown y Lucian Sharpe diseñan el primer micrómetro mecánico.

Aggiunto al nastro di tempo:

Metrología

12 gen 2018

0

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1622

Data:

1 gen 1870 anni

Adesso

~ 155 years ago

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