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| All Patents in class 74/450 | |||||
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| Number | Date | Patentee | Title | Type | |
| 379,198 | Mar. 06, 1888 | W.R. Fee | Wooden Split Pulley | industrial machine pulleys and belt drive mechanisms | |
| 578,731 | Mar. 16, 1897 | U. Eberhardt, F.L. Eberhardt | Wrought Metal Gear Wheel and Mechanism for Making Same | industrial machine gearing | |
| 1,415,840 | May 09, 1922 | D.C. Klausmeyer | Sectional Inspective Nut | metalworking machine mechanisms | |