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| Patents for Lester V. Colwell | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,684,673 | Aug. 15, 1972 | L.V. Colwell | Method and apparatus for analyzing and controlling the cleaning operation of an electrochemical grinding device | ||
| 3,697,403 | Oct. 10, 1972 | L.V. Colwell | Electrochemical grinding apparatus | ||