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Akin Spiral Classifier Diagram He spiral galaxies are recognized by their bright spiral arms mostly two and a central bulge inhabited mostly by older stars in hubbles classification this type of galaxies is denoted by the letter sfollowed by english letters a b and c which indicates the stretch of the spiral arms abeing close armed... As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.