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| All Patents in class 420/528 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,389,117 | Jun. 18, 1968 | D.I. Dally, V.G. Soukup, S.E. Kozdemba | Dressable Heat Conductive Backing for Abrasive Wheels | grinder wheels | |