| All Patents in class 251/304 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 89,674 | May 04, 1869 | T.W. Mahler | Improved Gate for Water Wheels | turbine water wheels |
| 418,011 | Dec. 24, 1889 | E. Gurney, C. Levey, C.W. Peniston | Radiator | steam heating |
| 608,243 | Aug. 02, 1898 | F.D. Winkley | Oil-hole cover or cap | oil or grease fittings |
| 2,042,782 | Jun. 02, 1936 | E.A. Hall | Dust Removing Means for Valve Seat Grinders or the Like | dust collectors |
| 2,042,783 | Jun. 02, 1936 | E.A. Hall | Adjusting Means for Sleeve Bearings | industrial machine bearings |
| 2,984,159 | May 16, 1961 | C. Maastricht, G.H. Schurger, E.F. Woytych | Machine Tool | horizontal boring mills |
