HJ

Henry D. Calk, Jr.

VG Vetco Gray: 1 patents #7 of 24Top 30%
📍 Richmond, TX: #9 of 24 inventorsTop 40%
🗺 Texas: #885 of 4,134 inventorsTop 25%
Overall (1989): #136,516 of 140,708Top 100%
1
Patents 1989

Issued Patents 1989

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4795128 Gate type kelly cock valve Igor Krasnov, Taylor L. Jones, Billy L. McDougal 1989-01-03