| All Patents in class 91/330 |
Patents 1 -
10
of 15
      |
| Picture | Number | Date | Patentee | Title |
| | 144,788 | Nov. 18, 1873 | W. Hopkins, G.G. Picking | Steam-Cylinders and Piston-Valves |
| | 358,435 | Mar. 01, 1887 | G.E. Dow | Steam Engine |
| | 359,707 | Mar. 22, 1887 | W. Brown | Valve for Steam Engines |
 | 425,219 | Apr. 08, 1890 | N.T. Greene | Exhaust-valve-gear for engines |
| | 430,311 | Jun. 17, 1890 | J.W. Eisenhuth | Cut-Off for Compound Engines |
| | 433,200 | Jul. 29, 1890 | W.H. Millward, W. Foster | Steam Actuated Valve |
| | 541,785 | Jun. 25, 1895 | J.F. Doolittle | Steam Hammer |
 | 693,939 | Feb. 25, 1902 | M.A. Yeakley | Pneumatic hammer |
| | 882,588 | Mar. 24, 1908 | W.T. Sears | Drop Hammer |
 | 1,580,094 | Apr. 06, 1926 | A. White | Tool-operating machine |
