Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888890 | Laser control of excavating machine digging depth | Robert H. Studebaker, Michael H. Kidwell | 1989-12-26 |
| 4836669 | Apparatus and method for projection of reference planes of light | — | 1989-06-06 |
| 4830489 | Three dimensional laser beam survey system | Gary Cain, DuWain K. Ake | 1989-05-16 |