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| All Patents in class 73/297 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,498,861 | Jun. 24, 1924 | W.O. Ashe | Water Column | boiler water gauges | |
| 1,502,650 | Jul. 29, 1924 | W.O. Ashe | Gauge Cock | boiler water gauges | |
| 1,689,191 | Oct. 30, 1928 | W.O. Ashe | Water Column | boiler water gauges | |
| 1,948,725 | Feb. 27, 1934 | J.D. McClintock | Safey Connection | low water alarms | |