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| All Patents in class 431/89 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,329,473 | Sep. 14, 1943 | W.S. Landon | Heating Apparatus | flow controls | |
| 2,344,946 | Mar. 28, 1944 | W.s. Landon | Controlling Means | flow controls | |