… Articles of stone, plaster, cement, asbestos, mica or similar materials …
Explanatory notes
… Chapter 68 Articles of stone, plaster, cement, asbestos, mica or similar materials Notes. 1.- This Chapter … : (A) Various products of Chapter 25 worked to a degree beyond that permitted by Note 1 to that Chapter. (B) The … by vitrification of the binding material); others may have been hardened in autoclaves (sand-lime bricks). The Chapter …