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| All Patents in class 411/938 | |||||
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| Number | Date | Patentee | Title | Type | |
| 658,085 | Sep. 18, 1900 | C.A. Higbee | Screw-coupling | industrial machine shaft couplings | |
| 658,086 | Sep. 18, 1900 | C.A. Higbee | Screw-coupling | industrial machine shaft couplings | |
| 1,897,666 | Feb. 14, 1933 | F.O. Hoagland | Machine Tool Spindle | metalworking power transmission | |