http://www.ipdl.ncipi.go.jp/homepg_e.ipdl 

http://www.wipo.int/ipdl/en/search/pct  
http://www.uspto.gov/patft/index.html 
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Lembaga Sentra Hki
Universitas Muhammadiyah Malang
Lembaga Sentra Hki
Universitas Muhammadiyah Malang