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| Patents for Robert C. Greenerd | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 464,316 | Dec. 01, 1891 | R.C. Greenerd | Machine for Applying and Removing Collars from Shafts | |
| 736,843 | Aug. 18, 1903 | R.C. Greenerd | Tool Grinder | ||
| 1,251,014 | Dec. 25, 1917 | R.C. Greenerd | Tire Protector | ||