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| All Patents in class 33/122 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 336,812 | Feb. 23, 1886 | E.E. Claussen, E. Kimmel | Instrument for Measuring the Mean Height of Steam Engine Indicator Diagrams | ||
| 360,867 | Apr. 12, 1887 | C.E. Emery | Planimeter | ||
 | 542,511 | Jul. 09, 1895 | E.J. Willis | Planimeter | |
 | 689,978 | Dec. 31, 1901 | A.C. Lippincott | Planimeter | |