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| All Patents in class 451/286 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,391,388 | Dec. 25, 1945 | E.J. Bullard | Grinding and Lapping Machine | lapping machines | |
| 2,565,590 | Aug. 28, 1951 | E.J. Bullard | Lapping Machine | lapping machines | |
| RE23,937 | Feb. 08, 1955 | B.B. Green, executrix, E.J. Bullard, deceased (estate of) | Lapping Machine | lapping machines | |
| 2,842,906 | Jul. 15, 1958 | R.D. Ryan, L.E. Carter | Work Holder for Lapping Machine | lapping machines | |
| 2,883,803 | Apr. 28, 1959 | C. Stead | Lapping Surface Conditioning Means | lapping machines | |