Those methodes can't be used for all kind of basis,because,how we said yet,each material of the base is different and because they have their own features, we will use some different ventilation system.
In the 60's, people moved the production and the knowledge of toupets, ventilation, coloring and other processes from the Japan to Qingdao, and this allowed the city to be the biggest and the most important production base of toupets in China.
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