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| All Patents in class 82/114 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,419,790 | Jun. 13, 1922 | L.E. Weddle | Ring Groove Cleaner | |
| 1,768,692 | Jul. 01, 1930 | R.A. Kaplan | Tool | ||
 | 2,109,057 | Feb. 22, 1938 | J.B. Ball, F.W. Billker | Cutting machine | |
 | 2,124,757 | Jul. 26, 1938 | W. Vaughan | Piston Ring Groove Cleaner | |
| 2,127,893 | Aug. 23, 1938 | C.D. Stromgren | Piston Ring Groove and Land Tool | ||
 | 2,412,748 | Dec. 17, 1946 | K.G. Phillips | Ring groove cleaner for pistons | |