Porcelain parts of long-rod porcelain insulators for electric transmission and transformation overhead lines (length of a single rod: 1-2m; solid) 輸變電架空線路用長棒形瓷絕緣子瓷件(單支長度爲1-2米,實芯),
Other porcelain insulators (including porcel- ain bushing insulators for non-electric trans- mission and transformation overhead lines) 其他陶瓷制絕緣子(包括非輸變電線路絕緣瓷套管),