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| All Patents in class 451/270 | |||||
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| Number | Date | Patentee | Title | Type | |
| 203,934 | May 21, 1878 | P. Pitkin, J.B. Dougherty | Stone Polishing Machine | stone dressing machines | |
| 6,213,851 | Apr. 10, 2001 | R.W. Barta, J.E. Garcia | Abrading apparatus | ||