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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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Fans with overlapping blades were invented (30 sept. 1920 – 30 sept. 1930)
Ajouté au bande de temps:
Heat Control Devices of the Past
By
Eric Wang
24 nov. 2017
0
0
537
Date:
30 sept. 1920
30 sept. 1930
~ 10 years
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