Joseph Proust
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Joseph Louis Proust, born September 26, 1754 in Angers in the Maine-et-Loire, departement of France - died July 5, 1826, was a chemist.

He first published his law of definite proportions (or Law of Constant Composition) in 1794.

The original article can be found at: http://en.wikipedia.org/wiki/Joseph_Proust.
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