B PERFORMING OPERATIONS; TRANSPORTING
B60 VEHICLES IN GENERAL
B60R VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
B60R3/00 Arrangements of steps; or ladders facilitating access to or on the vehicle; , e.g. running-boards
B60R3/02 Retractable steps; or ladders, e.g. movable under shock