Explanatory notes
… fused quartz or other fused silica); absorption drums for hydrochloric acid and trickling columns. (2) Articles for … (tanks, troughs, etc.) and horticultural appliances (cloches, etc.). (3) Letters, numbers, sign-plates and … of Chapter 90 . (d) Articles of Chapter 91 (e.g., glass clock cases, other than merely protective covers). (e) …