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Overview

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  • Fluent in Chinese (Simplified), English; learning English
  • 47, Male
  • Member since 2018
  • engineer
  • University diploma
  • From China
  • Profile 55% complete

About Me

www.hansejohn.com
ceramic filter/crystal filter/IF filter /RF filter/PZT/Piezo actuator
These are my product
I like to learn to drum up some new things.

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