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| All Patents in class 346/129 | |||||
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| Number | Date | Patentee | Title | Type | |
| 670,903 | Mar. 26, 1901 | J.J. McTighe | Indicator | steam engine power meters | |
| 1,761,163 | Jun. 03, 1930 | I.A. Weaver | King-pin testing appliance | vehicle mechanic | |
| 2,365,227 | Dec. 19, 1944 | C. Unterberg | Engine Operation Analyzer | internal combustion engine indicators | |