RH

Richard J. Helferich

UN Unknown: 1 patents #145 of 1,640Top 9%
📍 Encinitas, CA: #7 of 33 inventorsTop 25%
🗺 California: #2,144 of 10,592 inventorsTop 25%
Overall (1989): #65,948 of 140,708Top 50%
1
Patents 1989

Issued Patents 1989

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4864301 Variable speed transmission recording and retrieval of data — 1989-09-05