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| All Patents in class 73/740 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 829,552 | Aug. 28, 1906 | G. Spencer | Pressure Gage | ||
| 829,553 | Aug. 28, 1906 | G. Spencer | Pressure Gage | ||
| 1,043,618 | Nov. 05, 1912 | C.J. Manning | Pressure Gage | ||
| 1,166,070 | Dec. 28, 1915 | C.J. Manning | Gage for Indicating Fluid Pressures | ||
| 1,222,315 | Apr. 10, 1917 | C.J. Manning | Pressure Gage | ||
 | 1,265,934 | May 14, 1918 | L.A. Mapel | Gage | |
| 1,274,921 | Aug. 06, 1918 | F.J. Manning | Pressure Gage | ||
| 1,663,313 | Mar. 20, 1928 | J.W. Motherwell | Adjusting Mechanism for Pressure Gauges | ||