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| All Patents in class 346/139R | |||||
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| Picture | Number | Date | Patentee | Title | |
| 41,182 | Jan. 05, 1864 | W.B. Le Van, S.L. Wiegand | Steam Engine Indicator | ||
| 908,867 | Jan. 05, 1909 | W.E. Jerauld | Indicator for Engines | ||
| 1,028,155 | Jun. 04, 1912 | W.L. Trill | Continuous Indicator for Engines | ||
| 2,229,973 | Jan. 28, 1941 | A. Hormel | Conveyer for drying ovens | ||