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| All Patents in class 137/202 | |||||
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| Number | Date | Patentee | Title | Type | |
| 436,159 | Sep. 09, 1890 | H.E. Stager | Steam-radiator attachment | steam heating | |
| 540,760 | Jun. 11, 1895 | S. Sawyer | Automatic air and vacuum valve | radiators | |
| 2,281,566 | May 05, 1942 | L.W. Eggleston | Air Vent Valve | valves | |