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| Patents for Robert O. Walker | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,205,779 | Sep. 14, 1965 | R.O. Walker | Drawbolt for Machine Tool Spindles | ||
| 3,259,020 | Jul. 05, 1966 | R.O. Walker | Machine Tool Quill Clamping Mechanism | ||