JF

J. Robert Frederick

📍 Ashtabula, OH: #43 of 94 inventorsTop 50%
🗺 Ohio: #42,657 of 73,341 inventorsTop 60%
Overall (All Time): #4,018,063 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4528887 Tuning device for string instruments — 1985-07-16