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20h 19min, dec 31, 1912 y - Niel Bohr (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy) (copy)
Description:
Proposed hydrogen atom theory
Added to timeline:
30 Jan 2018
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Date:
20h 19min, dec 31, 1912 y
Now
~ 111 years ago