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| Patents for David C. Griggs | |||||
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| Number | Date | Patentee | Title | Type | |
| 624,101 | May 02, 1899 | D.C. Griggs, G. Rowbottom | Drop Hammer | drop hammers | |
| 851,677 | Apr. 30, 1907 | D.C. Griggs, G.B. Lamb | Drop Hammer | power hammers | |