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| All Patents in class 192/69.91 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,717,679 | Sep. 13, 1955 | G.O. Johnson | Clutch with antibacklash lock | punch presses | |
| 3,005,527 | Oct. 24, 1961 | A.I. Zagar | Positive drive tapping attachments | tapping machines | |
| 3,030,818 | Apr. 24, 1962 | A.I. Zagar | Positive drive tapping attachments | tapping machines | |