JM

John K. Martin

📍 Calgary, CA: #4 of 87 inventorsTop 5%
Overall (1989): #23,703 of 140,708Top 20%
2
Patents 1989

Issued Patents 1989

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
D302409 Rail insulator 1989-07-25
D301435 Railway crossing insert 1989-06-06