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| Patents Granted on 1990-03-13 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,907,476 | Mar. 13, 1990 | R.P. Singleton | Socket Wrench With Improved Handle | ratchet wrenches | |
| 4,907,481 | Mar. 13, 1990 | J. Dvorak, C.J. Dvorak | Powered press with manual punch and die alignment capability | metal punching machines | |