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| All Patents in class 346/73 | |||||
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| Number | Date | Patentee | Title | Type | |
| 454,391 | Jun. 16, 1891 | E. Verstraete | Speed Recorder and Register | rpm speed gauges and tachometers | |
| 1,043,825 | Nov. 12, 1912 | W.A. Griswold | Speed and Distance Indicating and Recording Device | speed and distance indicators | |