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| All Patents in class 92/189 | |||||
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| Number | Date | Patentee | Title | Type | |
| 331,360 | Dec. 01, 1885 | E.F. Woodbury, G. Patten, J. Merrill, J.A. Woodbury | Piston for Air Pumps | air pumps | |
| 821,546 | May 22, 1906 | H.E. Smallbone | Multiple Cylinder Engine | axial internal combustion engines | |
| 2,059,713 | Nov. 03, 1936 | H. Schneider | Engine Piston | pistons | |