// todo need optimize like in event.jsp. Add indexing or not indexing this page. Fans with overlapping blades were invented (30 set 1920 ano – 30 set 1930 ano) (Linha do tempo)
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Fans with overlapping blades were invented (30 set 1920 ano – 30 set 1930 ano)

Adicionado na linha do tempo:

Heat Control Devices of the Past

ByEric Wang
24 nov 2017

Data:

30 set 1920 ano
30 set 1930 ano
~ 10 years
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