DH

David R. Hayer

📍 Hoffman, MN: #2 of 2 inventorsTop 100%
🗺 Minnesota: #32,449 of 52,454 inventorsTop 65%
Overall (All Time): #4,031,594 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4438656 Power transfer device — 1984-03-27