JJ

John F. Johannsen

DM David Manufacturing: 1 patents #4 of 4Top 100%
📍 Charles City, IA: #23 of 49 inventorsTop 50%
🗺 Iowa: #8,735 of 15,303 inventorsTop 60%
Overall (All Time): #4,064,364 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4312750 Grain cleaning apparatus Keith Braun 1982-01-26