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| All Patents in class 279/19.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 779,084 | Jan. 03, 1905 | A. Jones | Drill or tool holder | ||
| 1,253,828 | Jan. 15, 1918 | C.A. Hultquist | Drill Steel Retaining Device | ||
| 1,755,269 | Apr. 22, 1930 | G.C. Pearson | Tool Holder | tool holders | |
| 2,720,401 | Oct. 11, 1955 | G.H. Fuehrer | Drill steel retainer | ||
| 2,958,534 | Nov. 01, 1960 | G.M. Fuehrer | Working tool retainer mechanism | ||