Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4790071 | Line trimmer with replaceable cutting blade assembly | Michael A. Helmig | 1988-12-13 |
| 4756148 | Line cutter with edging attachment | Otto D. Dunnebacke, Michael A. Helmig | 1988-07-12 |