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| Patents for William D. Roberts | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,692,460 | Oct. 26, 1954 | W.D. Roberts | Grinding apparatus for the traveling belt type | ||
| 2,712,204 | Jul. 05, 1955 | W.D. Roberts | Grinding apparatus of the traveling belt type | ||
 | CA-517,417 | Oct. 11, 1955 | W.D. Roberts | Grinding apparatus of the traveling belt type | |
 | CA-518,310 | Nov. 08, 1955 | W.D. Roberts | Grinding apparatus of the traveling belt type | |
| 2,798,340 | Jul. 09, 1957 | W.D. Roberts | Apparatus for grinding internal surfaces | ||