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| Patents Granted on 1991-02-12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,991,470 | Feb. 12, 1991 | R.P. Singleton | Socket Wrench With Improved Handle | ||
| 4,991,503 | Feb. 12, 1991 | R.W. Morner | High pressure intaglio cantilever press | ||