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Significados de saving in coal em inglês

Ainda não temos significados para "saving in coal".
Uso de saving in coal em inglês
1
Does not the expenditure of oil in large motors largely offset the saving in coal?
Scientific American Supplement, No. 799, April 25, 1891
2
And a saving in coal consumption of
Scientific American Supplement, No. 360, November 25, 1882
3
How is the saving in coal accomplished?
The Traveling Engineers' Association to Improve the Locomotive E...
4
Coal-mining is made safer to human life and much saving in coal is effected by the use of mine-timbers, which involves the planting of forests.
Checking the Waste: A Study in Conservation
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