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| Number | Title | Issue Date |
| 5697157 | Heavy-duty box opener A slitter comprising a blade having a cutting edge; a holder with blade, including a handle, and a terminal on the handle retaining the blade with the blade edge protruding; and a shield carried by the holder proximate the terminal, for movement between e... | 12/16/1997 |
| 5522135 | Box opener A box opener comprising a blade having a cutting edge; a holder with blade, including a handle, and a terminal on the handle retaining the blade with the blade edge protruding; and a shield carried by the holder proximate the terminal, for movement betwee... | 06/04/1996 |
