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| All Patents in class 74/810.1 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 650,465 | May 29, 1900 | H. Hubbell | Speed Indicator | |
| 687,827 | Dec. 03, 1901 | A.T. Hill | Record Motor for Engine Indicators | ||
| 838,118 | Dec. 11, 1906 | J.H. Karlson | Ratchet-drill | ||
 | 3,196,752 | Jul. 27, 1965 | W.M. Hoddinott, M. Wahlstrom | Transmission Converting Reverse Drive to Variable Speed | |