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| Patents Granted on 1971-04-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,574,315 | Apr. 13, 1971 | A.C. Boultinghouse | Portable power saw | circular crosscut saws | |
| CA-868,716 | Apr. 20, 1971 | J.C. Jones | Means for Truing Grinding Wheels | ||
| 3,576,057 | Apr. 27, 1971 | H.F. Hoy | Gripping device | box making machines | |