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The LED display is marked with trademark registration.
The ninth category

Scientific, navigation, geodesy, photography, film, optics, weighing instruments, measuring tools, signals, inspection (supervision), rescue (rescue) and teaching tools and instruments, instruments and instruments for processing, converting, transmitting, accumulating, regulating or controlling electric power, instruments for recording, communicating and playing back sounds and images, magnetic data carriers, recording discs, vending machines and coin starters.

Reference: http://202.108.90.72/trade/help/fenleihao.jsp.