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| Patents Granted on 1981-07-14 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,277,990 | Jul. 14, 1981 | R.L. Hall | Ratchet wrench | ||
| 4,277,998 | Jul. 14, 1981 | G.L. Mayo | Wood member cutting apparatus | truss making machines | |