www.google.eshttp://www.google.es/patents/US3226759?utm_source=gb-gplus-sharePatente US3226759 - DEVICE FOR CHANGING A FLOUR TREATING MACHINE FRO M A WAXING MACHINE T0 A VACUUM CLEANER
DEVICE FOR CHANGING A FLOUR TREATING MACHINE FRO M A WAXING MACHINE T0 A ...