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| Patents Granted on 1987-03-31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,653,300 | Mar. 31, 1987 | C.J. Crout, C.W. Frame, R.N. Harris | Adaptive, self-regulating forging hammer control system | drop hammers | |
| 4,653,561 | Mar. 31, 1987 | M. Payeur | Log debarking machine | debarking machines | |