| All Patents in class 122/437 |
Patents 1 -
5
of 5
      |
| Number | Date | Patentee | Title | Type |
| 186,783 | Jan. 30, 1877 | H.G. Ashton | Improvement in Safety-Valve Attachments to Utilize the Escape-Steam | steam safety valves |
| 197,073 | Nov. 13, 1877 | H.G. Ashton | Improvement in Safety-Valve Attachments to Utilize the Escape Steam | steam safety valves |
| 201,862 | Apr. 02, 1878 | H.G. Ashton | Improvement in Exhaust Mechanisms for Locomotives and Other Steam-Engines | steam safety valves |
| RE8,211 | May 07, 1878 | H.G. Ashton | Improvement in Safety-Valve Attachment to Utilize Escape-Steam | steam safety valves |
| 214,981 | May 06, 1879 | H.G. Ashton | Improvement in Safety-Valve Attachments | steam safety valves |
