JH

John Hammerbeck

📍 Westminster, GB: #56 of 277 inventorsTop 25%
Overall (All Time): #2,136,196 of 4,157,543Top 55%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
7549357 Ratio changing method and apparatus 2009-06-23
6508733 Variable speed drive 2003-01-21