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| Patents Granted on 1981-05-12 | |||||
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| Number | Date | Patentee | Title | Type | |
| CA-1,100,743 | May 12, 1981 | C.B. Sipek, R.B. Clegg, R. Johnstone | Tool storage magazine for a machine tool | tool changers and storage mechanisms | |
| 4,266,583 | May 12, 1981 | O.E. Raab, C.E. Kirk | Spindle turning tool | sharpening jigs and fixtures | |
| 4,267,495 | May 12, 1981 | B.W. Wilterdink | Machine Speed Controller | machine tool controls | |