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| Patents Granted on 1991-04-09 | |||||
| Number | Date | Patentee | Title | Type | |
| 5,005,449 | Apr. 09, 1991 | D.L. Gatzemeyer, J.A. Sorensen | Hand Tool or Improved Bar Clamp | clamps | |
| 5,006,193 | Apr. 09, 1991 | B.S. Quick | Automatic clamp tightener | ||