John Holmberg

BL Boart International, Limited: 2 patents #1 of 19Top 6%

📍 Springs, ZA: #14 of 48 inventorsTop 30%

Overall (All Time): #2,354,197 of 4,157,543Top 60%

Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
4530527	Connection of drill tubes	—	1985-07-23
4295751	Thread structure for percussion drill elements	—	1981-10-20