Hard coal sentence example

hard coal
  • Where coke or ordinary hard coal are used, the removal of clinkers should be done systematically, and the fires stirred.
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  • Thomas realized that this furnace could work at Ynyscedwyn, thus allowing him to use the hard coal called anthracite from local coal mines.
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  • Some of the countries discussed are significant exporters while others rely on imported hard coal for their energy supplies.
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