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| All Patents in class 73/491 | |||||
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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 | |
| 749,743 | Jan. 19, 1904 | T.H. McQuown | Speed-indicator | ignition systems | |