porcelain-arm insulator

... 瓷合金刀具 porcelain alloy cutter 瓷横担绝缘子 porcelain-arm insulator 瓷花金属板 plaque ...

 arm insulator

... 瓷绝缘子线轴 porcelain spool insulator 瓷绝缘子,瓷瓶 porcelain insulator 瓷横担绝缘子 arm insulator ...