insert
"Class H vacuum", for chapter 7A (Crystalline silica)—see section 418A (1).
"Class M vacuum", for chapter 7A (Crystalline silica)—see section 418A (1).
"crystalline silica control measure", for chapter 7A (Crystalline silica)—see section 418A (1).
"crystalline silica material", for chapter 7A (Crystalline silica)—see section 418A (1).