WC

Wun-Hai Chang

Overall (All Time): #2,137,885 of 4,157,543Top 55%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
7574946 Magnetic assembly of a screwdriver head rod 2009-08-18
7107882 Slip-resistant magnetic sheath for a screwdriver 2006-09-19