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| Patents for William C. De Roo | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,715,321 | May 28, 1929 | W.C. De Roo | Radial drill machine | |
 | 1,756,454 | Apr. 29, 1930 | W.C. De Roo | Spring counterbalance for drill spindles | |
 | 1,781,274 | Nov. 11, 1930 | W.C. De Roo | Feed-control mechanism | |
 | 1,799,358 | Apr. 07, 1931 | W.C. De Roo | Safety-catch mechanism | |
 | 1,825,181 | Sep. 29, 1931 | W.C. De Roo | Electrical operated column clamp for radial drills | |