Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4489322 | Radar calibration using direct measurement equipment and oblique photometry | Donald Zulch | 1984-12-18 |
| 4199759 | System for correlating electronic distance measurement and aerial photography for the extension of geodetic control | Donald Zulch | 1980-04-22 |