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16 ore 28 apr 1850 anni - Discovery of how to make efficient steel

Descrizione:

| WHO: | both Henry Bessemer in England and William Kelly in US | HOW: | blasting air through molten iron makes good steel

Aggiunto al nastro di tempo:

AP US History

10 mag 2018

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1508

Data:

16 ore 28 apr 1850 anni

Adesso

~ 175 years ago

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