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| All Patents in class 73/506 | |||||
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| Number | Date | Patentee | Title | Type | |
| 749,743 | Jan. 19, 1904 | T.H. McQuown | Speed-indicator | ignition systems | |
| 759,512 | May 10, 1904 | H. Frahm | Method of Measuring the Revolutions of Rotating Shafts | rpm speed gauges and tachometers | |