JM

John D. Markham

EI Electro Industries: 1 patents #5 of 28Top 20%
📍 Droylsden, GB: #2 of 4 inventorsTop 50%
Overall (All Time): #2,355,371 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4551659 Trackside-controlled electric railway systems 1985-11-05
4450388 Dynamic braking of direct current motors 1984-05-22