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| All Patents in class 74/491 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 193,182 | Jul. 17, 1877 | H.C. Root | Improvement in saw-set and file-guide | |
 | 393,682 | Nov. 27, 1888 | M.F. Williams | Clutch-pulley | |
 | 681,152 | Aug. 20, 1901 | E.E. Thomas | Cone friction-clutch | |
 | 917,015 | Apr. 06, 1909 | W. Runge, H.M. Darling | Gearing for machine-tools | |
| 2,540,427 | Feb. 06, 1951 | J.E. Justus, L.J. Charles | Locomotive Control Throttle Handle | ||
| 4,208,930 | Jun. 24, 1980 | O. Hermann | Spindle Control Mechanism | ||