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| All Patents in class 222/73 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,963,270 | Jun. 19, 1934 | F.F. Rike, W.P. Huffman | Pressure relief attachment | |
| 2,996,222 | Aug. 15, 1961 | L.A. Botkin | Airport hydrant system | ||
| 2,997,207 | Aug. 22, 1961 | K.D. Allen, L.A. Botkin | Flow control valve | ||