About 1 Trademarks found that are owned by Xu Zhengchao

Electronic personal emergency response system consisting of a device worn on the body with a button that users push to notify others in the event of an emergency, and a remote unit that dials out on the telephone for help; Electronic warning bells; Fire alarms; Sirens; Theft alarms; Acoustic alarms; Electric door bells; Electric buzzers; Electric locks; Electronic access control systems for interlocking doors; Magnifying peepholes for doors; Whistle alarms