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| All Patents in class 407/40 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 140,905 | Jul. 15, 1873 | J.F. Erdmann | Improvement in cutter-heads | |
| 470,462 | Mar. 08, 1892 | B.F. Barnes | Cutter-head | ||
| 1,924,887 | Aug. 29, 1933 | O. Severson | Inserted Cutting Blade Lock | ||
| 2,501,293 | Mar. 21, 1950 | H.M. Sheridan | Cutting Tool | ||
| 2,862,286 | Dec. 02, 1958 | T.V. Williams | Tool and Tool Holder | ||
| 3,309,758 | Mar. 21, 1967 | T.V. Williams | Cutting Tool | ||
| 3,405,433 | Oct. 15, 1968 | T.V. Williams | Rotary Machining Tool | ||