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| All Patents in class 74/473.21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,060,723 | May 06, 1913 | W.W. Vosper | Power Transmission and Control Mechanism. | pipe threading machines | |
| 1,622,159 | Mar. 22, 1927 | C.E. Linden | Safety Locking Device for the Shifting Mechanism of Metal Planers | metal planer accessories | |
| 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 | metalworking machine mechanisms | |