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| Patents for Oscar A. Perrigo | |||||
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| Number | Date | Patentee | Title | Type | |
| 110,951 | Jan. 17, 1871 | A.H. Brainard | Improvement in Back Centers for Milling Machines | milling machine accessories | |
| 111,311 | Jan. 31, 1871 | A.H. Brainard | Improvement in Head Stocks for Milling Machines | indexers and dividers | |