| Patents for R. T. Campbell |
Patents 16 -
29
of 29
      |
| Number | Date | Patentee | Title | Type |
| 94,749 | Sep. 14, 1869 | B. Holly | Hydrant | plumber |
| 97,953 | Dec. 14, 1869 | C.B. Morse | Improvement in cast-steel tube or ingot | |
| RE4,085 | Aug. 02, 1870 | B. Holly | Water Supply Regulator for Water Works | water regulators |
| RE4,086 | Aug. 02, 1870 | B. Holly | Water Supply Regulator | water regulators |
| RE4,087 | Aug. 02, 1870 | B. Holly | Water Supply Regulator | water regulators |
| 113,516 | Apr. 11, 1871 | B. Holly | Water Filter | water filters |
| 113,517 | Apr. 11, 1871 | B. Holly | Safety Valve | steam safety valves |
| 113,668 | Apr. 11, 1871 | B. Holly | Surface Condenser | steam condensers |
| 114,010 | Apr. 25, 1871 | B. Holly | Variable Cut Off | steam valves |
| 114,142 | Apr. 25, 1871 | B. Holly | Combined Heaters & Condensers | steam condensers |
| 116,189 | Jun. 20, 1871 | R. Hines, L. Beyer | Improvement in machines for sharpening saws | saw sharpening machines |
| 124,676 | Mar. 19, 1872 | A. Gastel | Improvement in Iron Planing Machines | metal planers |
| 128,470 | Jul. 02, 1872 | G.M. Darley | Improved Rabbet-Plane | rabbet planes |
| 133,092 | Nov. 19, 1872 | A. Gomersall | Improvement in Pipe-Tongs | pipe tongs |
