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| All Patents of Type: piston and ring maintenance | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,907,938 | May 09, 1933 | T. Thorsen, A. Storm | Piston turning and grinding machine | automotive tools | |
| 2,007,490 | Jul. 09, 1935 | H.W. Zimmerman | Ring filing structure | automotive tools | |