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| All Patents in class 60/392 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,271,817 | Feb. 03, 1942 | A.H. Dall, H. Ernst | Micrometer Mechanism | grinding machines | |
| 2,660,985 | Dec. 01, 1953 | H. Ernst | Hydraulic Feed System | hydraulic apparatus | |
| 2,682,748 | Jul. 06, 1954 | W. Ernst | Restrictor Valve for a Servomotor Circuit | hydraulic apparatus | |