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| Patents for Donald C. Elm | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,816,998 | Jun. 18, 1974 | H.W. Grivna, D.C. Elm | Method of and apparatus for rapidly abrading metal workpieces | metal sanding machines | |
| 3,893,265 | Jul. 08, 1975 | A.J. Stinn, D.C. Elm | Vertical abrasive belt type surface grinder | metal sanding machines | |