File:Steam engine efficiency.jpg

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Steam_engine_efficiency.jpg ‎(680 × 439 pixels, file size: 68 KB, MIME type: image/jpeg)

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current21:35, 1 February 2009Thumbnail for version as of 21:35, 1 February 2009680 × 439 (68 KB)WikiSysop (talk | contribs)

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