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| All Patents in class 137/434 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,067,836 | Jan. 12, 1937 | A.k. Foulds | Control Means | industrial control apparatus | |
| 2,277,006 | Mar. 17, 1942 | P.S. Russel | Control Device | flow controls | |