Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4469306 | Apparatus for pulling cable through underground conduit | Daniel Clifford Carlson, Edward C. Elwood, Eugene T. Stewart | 1984-09-04 |
| 4382581 | Apparatus for pulling cable through underground conduit | Daniel Clifford Carlson, Edward C. Elwood, Eugene T. Stewart | 1983-05-10 |