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Patent Certificate of Anti-Broken Ceramic Knife Sharpener

As the following picture showed, it is the Patent Certificate of Anti-Broken Ceramic Knife Sharpener in USA:

As the following picture showed, it is the Patent Certificate of Anti-Broken Ceramic Knife Sharpener in Taiwan:

As the following picture showed, it is the Patent Certificate of Anti-Broken Ceramic Knife Sharpener in China:

As the following picture showed, it is the Patent Certificate of Anti-Broken Ceramic Knife Sharpener in Germany: