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| All Patents in class 346/44 | |||||
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| Number | Date | Patentee | Title | Type | |
| 495,148 | Apr. 11, 1893 | R.G. Collins | Electro Mechanical Steam Recording Indicator | industrial recording apparatus | |
| 530,433 | Dec. 04, 1894 | F. Lane | Indicator for Steam Engines | steam engine indicators | |
| 1,890,601 | Dec. 13, 1932 | C.E. Cox | Internal Combustion Indicator | internal combustion engine indicators | |