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| All Patents in class 374/42 | |||||
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| Number | Date | Patentee | Title | Type | |
| 857,984 | Jun. 25, 1907 | L.M. Ellison | Steam Calorimeter | steam calorimeters | |
| 1,093,244 | Apr. 14, 1914 | C.W. Berry | Recorder | internal combustion engine indicators | |