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| All Patents in class 346/5 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,093,244 | Apr. 14, 1914 | C.W. Berry | Recorder | internal combustion engine indicators | |
| 1,182,628 | May 09, 1916 | C.W. Berry | Recorder | steam engine indicators | |
| 1,336,810 | Apr. 13, 1920 | A.O. Benecke | Engine Indicator | steam engine indicators | |