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| All Patents in class 60/444 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,861,116 | May 31, 1932 | W. Ernst | Control Mechanism for Pumps | hydraulic pump controls | |
| 3,400,881 | Sep. 10, 1968 | G.N. Levesque | Compressed Air Economizer for Fluidic Controls | ||