VR

Virgil C. Rostvold

TM The Hanna Mining: 1 patents #7 of 10Top 70%
📍 Nashwauk, MN: #4 of 5 inventorsTop 80%
🗺 Minnesota: #32,449 of 52,454 inventorsTop 65%
Overall (All Time): #4,029,147 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4430056 Pressure actuated seal for travelling grate — 1984-02-07