DH

David P. Hofstad

📍 Sioux Falls, SD: #1 of 4 inventorsTop 25%
🗺 South Dakota: #4 of 34 inventorsTop 15%
Overall (1982): #17,463 of 81,411Top 25%
1
Patents 1982

Issued Patents 1982

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4314498 Drum having internal double acting control to provide variable pitch — 1982-02-09