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| All Patents in class 137/884 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,871,886 | Feb. 03, 1959 | N.V. Gusching, J. Obreski | Manifold | ||
| 3,603,346 | Sep. 07, 1971 | A. Hirt | Pneumatic Logic Element | ||
| 3,610,274 | Oct. 05, 1971 | A. Hirt, G.N. Levesque | Fluid Logic Circuit | ||