WB

William J. Butler

📍 Duluth, MN: #3 of 12 inventorsTop 25%
🗺 Minnesota: #156 of 1,035 inventorsTop 20%
Overall (1982): #24,382 of 81,411Top 30%
1
Patents 1982

Issued Patents 1982

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4334626 Discharge cone assembly for a rotary grinding mill or the like — 1982-06-15