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| Patents for Roberts & Pierce | |||||
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| Number | Title | Classification(s) | |||
| 9,957 | Lathe attachment | 142/43 | |||
| 12,115 | Machine for turning prismatic forms | 142/11, 144/138, 144/154 | |||
| 14,899 | Cutter-head for lathes | 144/117.1, 144/226, 16/386 | |||