DZ

Djurre Hans Zijsling

Shell Oil Compny: 3 patents #34 of 337Top 15%
Overall (1989): #11,123 of 140,708Top 8%
3
Patents 1989

Issued Patents 1989

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
4854399 Tubular element for use in a rotary drilling assembly — 1989-08-08
4844180 Downhole drilling motor — 1989-07-04
4830124 Rotary drill bit — 1989-05-16