The planing machine for wood floors includes a truck with retractable front wheels and with a rear wheel which is provided with means for varying the attitude of the machine when the direction of motion changes; a treatment head which is provided with two abrasive paper supporting rollers which rotate...http://www.google.es/patents/US5287660?utm_source=gb-gplus-sharePatente US5287660 - Planing machine for wood floors
