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| All Patents in class 238/131 | |||||
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| Number | Date | Patentee | Title | Type | |
| 74X | Mar. 23, 1794 | J.O. Peerson | Machine for Cutting Nails | nail making machines | |
| 6,715X | Aug. 23, 1831 | J. Stimpson | Rails or Plates for Railroad Carriage Wheels | track and switches | |
| RX-23 | Aug. 26, 1840 | J. Stimpson | Improvement in the mode of Forming and Using Cast or Wought Iron Plates or Rails for Railroad-Carriage Wheels to run upon | track and switches | |