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16 ч 28 апр 1850 г. - Discovery of how to make efficient steel

Описание:

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

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AP US History

ByZoe
10 мая 2018
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16 ч 28 апр 1850 г.
Сейчас
~ 175 г назад
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