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Lord Kelvin, British mathematician and physicist ; 1897
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| Number | Title | Issue Date |
| 6045608 | Apparatus and process for manufacturing asphalt An improved process for making asphalt involves incorporating tar sands into a hot asphalt mix process and modifying the process. The improved process involves using a heated asphalt counter-flow drum mixer to admix asphaltic cement, coarse aggregate, and... | 04/04/2000 |