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| All Patents in class 123/90.12 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,384,701 | Sep. 11, 1945 | H. Schreck | Hydraulic Operating Unit | ||
| 2,396,392 | Mar. 12, 1946 | H. Schreck | Hydraulic Operation of Mechanism | ||