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| | machine. The Columbia Encyclopedia, Sixth Edition. 2001-05 |
 | | arrangement of moving and stationary mechanical parts used to perform some useful work or to provide transportation. |
 | | Complex machines are designated, as a rule, by the operations they perform; the complicated devices used for sawing, planing, and turning, for example, are known as sawing machines, planing machines, and turning machines respectively and as machine tools collectively. |
 | | Its operation is the reverse of that of the electric generator, which transforms the energy of falling water or steam into electrical energy. |
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