JJ

John K. Langsdon, Jr.

📍 Columbia, TN: #31 of 87 inventorsTop 40%
🗺 Tennessee: #10,964 of 20,272 inventorsTop 55%
Overall (All Time): #4,087,952 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4262771 Safety device for crossing railroads — 1981-04-21