| All Patents in class 91/234 |
Patents 1 -
8
of 8
      |
| Number | Date | Patentee | Title | Type |
| 46,470 | Feb. 21, 1865 | W.C. Hicks | Improvement in steam-engines | steam engines |
| 80,550 | Aug. 04, 1868 | D. Joy | Steam Hammer | steam hammers |
| 355,037 | Dec. 28, 1886 | E.C. Terry | Piston Water Meter | water meters |
| 514,169 | Feb. 06, 1894 | N. Tesla | Reciprocating engine | |
| 517,900 | Apr. 10, 1894 | N. Tesla | Steam-Engine | |
| 518,032 | Apr. 10, 1894 | W.E. Gibbs | Percussion Tool | |
| 2,260,624 | Oct. 28, 1941 | A.S. Johann | Sheet Metal Shaper | sheet metal |
| 2,561,577 | Jul. 24, 1951 | R.G. Knudsen | Pneumatic Impact Pullers and the Like | |
