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last 30 patents
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Patent Application
System and Method for Implementing Prepaid Data Services
Publication number
20070217581
Publication date
Sep 20, 2007
Guojun Dai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Patent Application
Method and apparatus for drilling preforms for holey optical fibers
Publication number
20070062337
Publication date
Mar 22, 2007
Guojun Dai
C03 - GLASS MINERAL OR SLAG WOOL