File: Closed loop system horiz.gif
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:31, 28 February 2014 | | 319 × 304 (13 KB) | Rick Swarts (talk | contribs) | This file is in the public domain, being produced by the United States Department of Energy (http://energy.gov/energysaver/articles/geothermal-heat-pumps). |
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