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| All Patents in class 73/716 | |||||
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| Number | Date | Patentee | Title | Type | |
| 188,451 | Mar. 13, 1877 | S. Wheeler | Improvement in indicators | low water alarms | |
| 908,206 | Dec. 29, 1908 | C.H. Craig, Jr. | Differential Pressure Gage | vacuum and pressure gauges | |