The Colliery Engineer ...

The Colliery Engineer ...

4.11 - 1251 ratings - Source

CHICAGO Ora#39;PtcE: 1006 Michigan Ave. ... 5E Q N mining and milling operations, it pays to substia€” I tute machinery for manual labor, if the interest on the cost of the machine plus ... than the wages paid for the manual labor which it replaces.

Title:The Colliery Engineer ...
Publisher: - 1912


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