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Donald B. Ketcham

3M: 1 patents #7,233 of 11,543Top 65%
📍 Lakeville, MN: #334 of 513 inventorsTop 70%
🗺 Minnesota: #32,449 of 52,454 inventorsTop 65%
Overall (All Time): #3,772,029 of 4,157,543Top 95%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
5420742 Degausser for tape with plural recorded segments Robert P. McCollam, Kent Kalar 1995-05-30