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| All Patents in class 73/711 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 292,169 | Jan. 22, 1884 | W.H. MacGregor | Pressure Gage | |
| 1,169,982 | Feb. 01, 1916 | C.J. Manning | Pressure Gage | ||
| 1,933,383 | Oct. 31, 1933 | J.W. Motherwell | Gauge | ||