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| All Patents in class 92/249 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 348,998 | Sep. 14, 1886 | J.F. Place | Gas Engine | |
| 925,224 | Jun. 15, 1909 | F.A. Pritshau | Insulating Piston for Steam Engines | ||
| 2,287,456 | Jun. 23, 1942 | R.C. Springston | Sealing Means | ||
| 3,802,323 | Apr. 09, 1974 | S. W | Piston and piston rod assembly for hydraulic jack | ||