RE

Roger P. Engdahl

UN Unknown: 1 patents #172 of 2,033Top 9%
📍 Windom, MN: #58 of 214 inventorsTop 30%
🗺 Minnesota: #695 of 2,841 inventorsTop 25%
Overall (1994): #76,111 of 165,921Top 50%
1
Patents 1994

Issued Patents 1994

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
5307699 Seismic initiator for earthquake shutoff valves and the like Paul D. Engdahl 1994-05-03