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Apple applied for patent at U. S. patent and Trademark Office in 2009.
苹果在2009年向美国专利与商标局申请这项专利。
youdao
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Senior Attorney of CCPIT Patent and Trademark Law Office.
中国贸促会专利商标事务所资深律师。
youdao
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Senior Attorney of CCPIT Patent and Trademark Law Office.
中国贸促会专利商标事务所资深律师。
youdao