Products based on built up or treated mica paper for electrical insulation; formed rigid mica materials for commutators, dimensions
以组合或处理过的云母纸为基础的电气绝缘产品；换向器用成型硬质云母材料.尺寸

1977-10-01

Products based on built up or treated mica paper for electrical insulation; laminated sheets and strips, dimensions
以组合或处理过的云母纸为基础的电气绝缘产品；层压薄板和带材.尺寸

1976-03-01

Products Based on Built-up or Treated Mica Paper for Electrical Insulation; Insulating Laminae for Commutators; Dimensions
以组合或处理过的云母纸为基础的电气绝缘产品；换向器绝缘层；尺寸

1971-07-01