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| All Patents in class 251/304 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 89,674 | May 04, 1869 | T.W. Mahler | Improved Gate for Water Wheels | |
 | 418,011 | Dec. 24, 1889 | E. Gurney, C. Levey, C.W. Peniston | Radiator | |
 | 608,243 | Aug. 02, 1898 | F.D. Winkley | Oil-hole cover or cap | |
| 2,042,782 | Jun. 02, 1936 | E.A. Hall | Dust Removing Means for Valve Seat Grinders or the Like | ||
| 2,042,783 | Jun. 02, 1936 | E.A. Hall | Adjusting Means for Sleeve Bearings | ||
| 2,984,159 | May 16, 1961 | E.F. Woytych, C. Maastricht, G.H. Schurger | Machine Tool | ||