Control: KELCO 40 - Year of manufacture: presumably 1987 - Technical data (without guarantee) Spindle provided with inner cone MK 5 and a through hole diameter 38.2 mm - Grinding wheel diameter: 400 - 500 mm - Speed range: 1720 - 1910 rpm - Grinding wheel peripheral speed range: 40 - 45 m/sec - Centre height: 125 mm - Centre distance: 1000 mm -