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