… used for concrete aggregates, for road metalling or for railway or other ballast, shingle and flint, whether or not heat-treated; macadam of slag, dross or similar industrial waste, whether or not incorporating the …
Explanatory notes
… used for concrete aggregates, for road metalling or for railway or other ballast, shingle and flint, whether or not heat‑treated; macadam of slag, dross or similar industrial waste, whether or not incorporating the … shingle and flint. Round modules of flint are used in ball mills for crushing lime, cement, etc. Flint is, however, …