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| All Patents in class 408/92 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,034,258 | Jul. 30, 1912 | G.O. Leopold | Chain Drill | drill accessories | |
| 1,060,467 | Apr. 29, 1913 | G.O. Leopold | Chain Drill | drill accessories | |
| 1,249,794 | Dec. 11, 1917 | S. McClellan | Ratchet chain breast-drill | breast drills | |