Gubernatio certificationis ------ Yison XXV annos productionis experientiam in industria audiendi habet, mercatus experimentum transiit et a gubernatione agnitus est et multa testimonia edidit quae nos agnoscunt.
Export Certificate ------ In terms of Export, nos facilitate import de customers, et ut providere melius export commodum, ut applicare pro nova uber export libellum omni anno.
Patent certificate------Yison has been in the audio industry for 25 years, independent research and development, independent design, independent mold opening, independent production, and obtained more than 50 patent certificates, and also received a lot of positive feedback a clientibus.
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