DS

David A. Schalk

📍 Festus, MO: #1 of 6 inventorsTop 20%
🗺 Missouri: #751 of 2,681 inventorsTop 30%
Overall (2020): #496,458 of 565,922Top 90%
1
Patents 2020

Issued Patents 2020

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
10766511 Cable driven railroad switch indicator — 2020-09-08