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| All Patents in class 74/420 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,507,254 | Sep. 02, 1924 | W.T. Sears | Auxiliary spindle and head for radial drills | radial drill presses | |
| 1,692,487 | Nov. 20, 1928 | E.L. Connell | Motor-driven threading tool | ||
| 2,905,027 | Sep. 22, 1959 | M.F. Saczawa, T.W. Budney, H.S. Budney, M.P. Budney | Jig Borer Having Auxiliary Transmission and Improved Elevating Mechanism | jig boring machines | |