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.