// todo need optimize like in event.jsp. Add indexing or not indexing this page. The steam shovel is invented and eventually becomes instrumental in mechanizing surface coal mining. (30 jan 1839 ano – 17 nov 1970 ano) (Linha do tempo)
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The steam shovel is invented and eventually becomes instrumental in mechanizing surface coal mining. (30 jan 1839 ano – 17 nov 1970 ano)

Adicionado na linha do tempo:

coal timeline

Byhose
8 dez 2017

Data:

30 jan 1839 ano
17 nov 1970 ano
~ 131 years
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