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| All Patents in class 411/339 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,940,455 | Dec. 19, 1933 | A.E. Kilpela | Gear Retaining Means | metalworking machine gearing | |
| 5,741,102 | Apr. 21, 1998 | R.R. Trimmell, G.W. Everett | Removable quasi-ratchet fastener | ||
| 5,842,822 | Dec. 01, 1998 | R.R. Trimmell, G.W. Everett | Removable quasi-ratchet fastener | ||