// todo need optimize like in event.jsp. Add indexing or not indexing this page. helicopters invented (30 dic 1938 anni – 28 feb 1941 anni) (Il nastro del tempo)
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helicopters invented (30 dic 1938 anni – 28 feb 1941 anni)

Aggiunto al nastro di tempo:

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ByAnna Huey
19 nov 2018

Data:

30 dic 1938 anni
28 feb 1941 anni
~ 2 years and 2 months
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