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dec 13, 1817 - Johann Dobereiner
Description:
https://docs.google.com/document/d/1roBCDQMnIk1hobTm8u04ncIwAUhhMH2CElI1yhXZYp8/edit
Added to timeline:
17 Sep 2018
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Date:
dec 13, 1817
Now
~ 206 years ago