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| All Patents in class 264/255 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,116,986 | Jan. 07, 1964 | E.C. Johns, G.J. Geopfert | Method of Making Cold-Molded Abrasive Wheel | grinder wheels | |
| 3,523,152 | Aug. 04, 1970 | R.W. Curtis | Process for Making Plastic Articles | manufacturing processes | |