Inventor

ZHANG ZE YU

CN3 patents

Patents

3 patents

US8052343B2Nov 8, 2011

Ring binder mechanism

WORLD WIDE STATIONERY MFG CO20 citations89

US7648302B2Jan 19, 2010

Ring binder mechanism

WORLD WIDE STATIONERY MFG CO32 citations89

US8047737B2Nov 1, 2011

Ring binder mechanism

WORLD WIDE STATIONERY MFG CO6 citations69