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| All Patents in class 251/61.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,582,037 | Jun. 01, 1971 | G.N. Levesque | Pneumatic Logic Element Construction | ||
| 3,610,274 | Oct. 05, 1971 | A. Hirt, G.N. Levesque | Fluid Logic Circuit | ||