About 1 Trademarks found that are owned by Zhang Changyu

Alcoholmeters; Pagers; Call bells; Electric door bells; Electronic alarm for providing notice of bed-wetting; Electronic devices for locating and tracking lost articles, people, pets using cellular communication networks; Electronic devices used to locate lost objects employing radio frequency; Electronically encoded identity wristbands; Labels carrying magnetically, optically, or electronically recorded or encoded information; Paging apparatus; Paging equipment; Radio pagers; Wireless queue buzzers