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| All Patents in class 235/104 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 418,411 | Dec. 31, 1889 | L.B. Holmes | Speed Indicator | |
 | 502,649 | Aug. 01, 1893 | H.C. Andersen | Speed Indicator for Shafting | |
 | 749,743 | Jan. 19, 1904 | T.H. McQuown | Speed-indicator | |