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| Patents Granted on 1971-09-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,606,177 | Sep. 20, 1971 | D.K. Alexander, J.J. Denovan | Wood pulp grinder | wood grinding machines | |
| 3,606,455 | Sep. 20, 1971 | A.G. Carter | Safety harness | ||
| 3,606,562 | Sep. 20, 1971 | M. Wills | Offset Boring Head | boring heads | |