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| All Patents of Type: clutch maintenance | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,208,879 | Jul. 23, 1940 | J.Y. Blazek, V.R. Roy | Grinder for clutch pressure-plates | clutch maintenance | |
| 2,285,377 | Jun. 02, 1942 | J.C. Inman | Surfacing machine | gasket surface maintenance | |