the wireless contact device realizes the wireless contact between the chief referee and the side referee, simplifies the complexity of the signal transmitter and saves the battery and cost.
本发明可以实现足球主裁判与边线裁判的无线联络,简化了信号发射机的复杂度,省去了电池,节省成本。
chief referee & referees: shen zhen u. s. sports ltd. will appoint the referees and staff.
仲裁委员和裁判:裁判员及工作人员由深圳市美儿体育发展有限公司统一委派。
chief referee & referees: the china golf association will appoint the referees and staff.
仲裁委员和裁判:裁判员及工作人员由中国高尔夫球协会统一委派。
every year, she served as chief referee or director of board of arbitration for u.