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| Patents for George H. Gilman | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,252,374 | Jan. 01, 1918 | G.H. Gilman | Drilling Machine | ||
| 1,252,375 | Jan. 01, 1918 | G.H. Gilman | Drilling Apparatus | ||
| 1,279,532 | Sep. 24, 1918 | G.H. Gilman | Drilling Apparatus | ||
| 1,286,994 | Dec. 10, 1918 | G.H. Gilman | Method of Drilling Holes | ||