Porcelain parts of long-rod porcelain insulators for electric transmission and transformation overhead lines (length of a single rod: 1-2m; solid) 输变电架空线路用长棒形瓷绝缘子瓷件(单支长度为1-2米,实芯),
Other porcelain insulators (including porcel- ain bushing insulators for non-electric trans- mission and transformation overhead lines) 其他陶瓷制绝缘子(包括非输变电线路绝缘瓷套管),