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| All Patents in class 92/91 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 29,646 | Aug. 14, 1860 | A.J. Allen | Steam Pressure Gage | |
| 1,044,678 | Nov. 19, 1912 | C.J. Manning | Recording Low Pressure Gage | ||
| 2,166,165 | Jul. 18, 1939 | B.A. Linderman | Fluid operated pressure transmission device | ||