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| All Patents in class 137/533.29 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,815,040 | Dec. 03, 1957 | R.V. Smith | Pressure relief valve | steam safety valves | |
| 3,294,363 | Dec. 27, 1966 | J.M. Zeigler, E.F. Winkle | Diverter spout construction | oil cans | |