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| Patents for Robert L. Donahue | |||||
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| Picture | Number | Date | Patentee | Title | |
| 4,598,481 | Jul. 08, 1986 | R.L. Donahue | Intersecting laser alignment apparatus and method | ||
| 4,630,380 | Dec. 23, 1986 | R.L. Donahue | Hole gauge | ||
| 4,663,855 | May 12, 1987 | H.F. Hamilton, R.L. Donahue | Drive-in, drive-out vehicle alignment system | ||
| 4,691,443 | Sep. 08, 1987 | H.F. Hamilton, R.L. Donahue | Drive-in, drive-out vehicle alignment system | ||