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Inventor
CHIAO YEN-JUI
TW
2 patents
Patents
2 patents
US7689407B2
Mar 30, 2010
Method of learning a second language through the guidance of pictures
YANG KUO-PING
33 citations
88
USD544881S
Jun 19, 2007
Audio recording and playing device
YANG KUO-PING
8 citations
70