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| All Patents in class 409/227 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,338,624 | Jan. 04, 1944 | F.W. Curtis | Elevating Mechanism for Machine Tool Knees | milling machines | |
| 2,908,204 | Oct. 13, 1959 | K.A. Riedel | Knee Deflection Eliminator | milling machines | |
| 2,947,227 | Aug. 02, 1960 | K.A. Riedel, C.A. Parske | Twin Screw Elevating Mechanism | milling machines | |
| 3,263,571 | Aug. 02, 1966 | F. Zankl | Counterbalance for a Machine Tool | milling machines | |