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All Patents in class 451/270
Patents 1 - 2 of 2
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

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