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| All Patents in class 74/473.21 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,060,723 | May 06, 1913 | W.W. Vosper | Power Transmission and Control Mechanism. | ||
| 1,622,159 | Mar. 22, 1927 | C.E. Linden | Safety Locking Device for the Shifting Mechanism of Metal Planers | ||
| 2,335,797 | Nov. 30, 1943 | J.H. Schreiber, F.H. Dean | Gear shift locking device | ||
 | 2,673,472 | Mar. 30, 1954 | N.R. Logan, F.D. Dickas | Variable speed mechanism | |
| 3,274,843 | Sep. 27, 1966 | H.E. Luebkemann | Lathe Transmission Mechanism | ||