| X Number | Date | Inventor | City | Title |
|---|---|---|---|---|
| NX-4000 | 1824-12-28 | Aaron Dana | Troy, Rensselaer County, NY | Casting balance beams with notches |
Listed in List of Patents for Inventions and Designs, 1847, pgs. 40 & 414.
NX series patents are X-patents that do not have numbers. They have been arbitrarily assigned NX numbers to allow them to be entered into the Datamp file. We do not know whether they were actual patents as all that we have are the listings. They are entered here for reference and further research only.
(To be filled in.)