Class 7: Abrasive wheels for power-operated grinders; Grinding machines for the treatment of ceramics and metal; Grinding and polishing machines; Grinding tools for grinding machines; Wheel adapters for power-operated grinders; Components for machines and machine tools, grinding machines, material handling machines, food processing machines, chemistry processing machines and textile industry machines, namely, sand, chemical and reverse osmosis filters; Milling machines and grinding machines for the treatment of ceramics and metal; Polishing machines for use in grinding and polishing metal, wood, ceramics and plastics; Polishing system for use in single-head machines comprising grinding and polishing discs for stone profiling and edges; Power-operated abrasive wheels; Rotary grinding machines; Tool grinding machines; all the aforementioned made in whole or significant part of diamond