RD

Richard Forbes Donald-Hill

📍 Bandar Jengka, MY: #4 of 16 inventorsTop 25%
Overall (All Time): #2,271,542 of 4,157,543Top 55%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
5692581 Anti-slip device for ladder rungs John R. Nelson 1997-12-02
5645912 Anti-skid staircase treads John R. Nelson 1997-07-08