21
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en
AIzaSyCYaC8UkdPkQKLFUmpasLV5eC3M802CrcA
268742
23530
2

jan 5, 1927 - Studied the effects of lighting on work productivity

Added to timeline:

12 Nov 2017
0
0
84
CLEODORO

Date:

jan 5, 1927
Now
~ 92 years ago
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