8464 - Machine tools for working stone, ceramics, concrete, asbestos-cement or like mineral materials or for cold working glass:

Category 8464 encompasses specialized machine tools designed for the working of mineral materials. This includes machinery for cutting, shaping, grinding, polishing, or otherwise processing substances such as stone, ceramics, concrete, asbestos-cement, and similar non-metallic mineral compounds. The primary function of these machines is to alter the physical form of these materials, typically through abrasive, cutting, or impact mechanisms.

Unlike other broad machinery categories within Chapter 84 that might focus on metalworking (e.g., 8456-8463) or woodworking, 8464 is specifically delineated by the type of material being worked. It does not cover machinery for processing organic materials like wood or plastics, nor does it include tools primarily for manufacturing or repairing the materials themselves, such as kilns for firing ceramics.

Within 8464, the subcategories distinguish machines based on their primary operational function. 8464.10 covers sawing machines, used for cutting these mineral materials into desired shapes or sizes. 8464.20 includes grinding or polishing machines, which refine surfaces to achieve specific finishes. The residual category, 8464.90, captures all other machine tools for working these mineral materials that do not fall into the sawing, grinding, or polishing classifications, such as drilling or carving machines specific to these materials.