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8172128 | Counter device | Jun 08, 07 | May 08, 12 | Not available |
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5896671 | Universal scale and conversion tool | Feb 21, 97 | Apr 27, 99 | Not available |
5725380 | Combination writing board and abacus | Jan 14, 97 | Mar 10, 98 | ABB AB |
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5334026 | Manual sliding calculator | Jun 07, 93 | Aug 02, 94 | Not available |