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SurfIP.com, http://www.surfip.com.

IPOrganizer.com, http://www.iporganizer.com.

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CNIDR U.S. Patent Database, http://patents.cnidr.org:2424/access/access.html.

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COS US Patent Database, http://patents.cos.com.

Questel Orbit Patent Database, http://www.qpat.com.

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