Explanation
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http://crayfishoosaka110207.blog28.fc2.com/blog-entry-608.html
Http://crayfishoosaka110207.blog28.fc2.com/
I manufacture and sell micro bubble generator for domestic aquarium in Japan.
We are selling micro bubble generators at 80 stores in Japan.
Youtube introduction video
https://www.youtube.com/watch?v=OJJ-b85-tP8
