Stone Polishing Machine SIGMA MACHINE TOOLS are a well-known Stone Polishing Machine Manufacturer and Exporter in India. SIGMA MACHINE TOOLS are manufacturers and exporters of Machinery for Granite, Marble, Sand Stone & other stones. Our Product range includes Block Slicing Machines, Polishing Machines, Edge Cutting / Trimming Machines, CNC Stone Engraving Machines (Router). We also…