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Lord Kelvin, British mathematician and physicist ; 1897
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| Number | Title | Issue Date |
| 6412575 | Coring bit and method for obtaining a material core sample The present invention provides a brush bit for cutting a core sample from an unconsolidated formation with reduced fragmentation or damage to the core sample by using a plurality of stiff bristles to cut rock from around the core sample. The present inven... | 07/02/2002 |