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| All Patents in class 285/330 | |||||
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| Number | Date | Patentee | Title | Type | |
| 487,829 | Dec. 13, 1892 | W.R. England | Pipe-Coupling | auxiliary wrenches | |
| 1,998,653 | Apr. 23, 1935 | T. Briegel | Tube jointing machine | electrician | |
| 2,017,154 | Oct. 15, 1935 | E.T. Larkin | Valve Seat Construction for Engines and the Like | valves | |