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| All Patents in class 72/237 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 201,530 | Mar. 19, 1878 | C.F. Jacobson | Machine for Making Twist Drills | ||
| 245,741 | Aug. 16, 1881 | T.W. Webb, P.D. Nicols | Machine for Twisting Drill Blanks | ||
 | 290,612 | Dec. 18, 1883 | W.W. Tucker | Knurling-tool | |
| 1,561,803 | Nov. 17, 1925 | H.C. Smith | Strip-Straightening Attachment For Rotary Shears | ||
| 3,570,296 | Mar. 16, 1971 | J.R. Buta | Automatic spacer blocks for rolling mill work roll chocks | ||