John L. Hartstone

TL Tru-Test Limited: 1 patents #8 of 31Top 30%

📍 Palmerston North City, NZ: #48 of 209 inventorsTop 25%

Overall (All Time): #2,298,714 of 4,157,543Top 60%

Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
5176035	Metering arrangement	—	1993-01-05
4966198	Metering arrangement	—	1990-10-30