for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders

Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor > Single-purpose machines or devices > for grinding end faces, e.g. of gauges, rollers, nuts or piston rings > for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders

Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor (B24B21/00 takes precedence; honing of plane surfaces on work B24B33/055) > Single-purpose machines or devices (grinding tools or machines specially designed for use on assembled railway track E01B31/17) > for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings (for combined grinding of surfaces of revolution and adjacent plane surfaces on work B24B5/01; for grinding edges of bevels on work B24B9/00) > for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders