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| All Patents in class 122/504.2 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 25,486 | Sep. 20, 1859 | S.W. Brown | Steam Pressure Indicator or Alarm | |
| 1,101,143 | Jun. 23, 1914 | H. Neville | Vacuum Pump | ||