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During WWI, fans were hard to make due to brass shortages from ammunition production (19 nov 1914 ano – 19 mar 1918 ano)

Adicionado na linha do tempo:

Heat Control Devices of the Past

24 nov 2017

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537

Data:

19 nov 1914 ano

19 mar 1918 ano

~ 3 years and 3 months

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