The disclosed hot water extraction cleaning machine employs a conventional canister-type wet/dry vacuum cleaner having a suction tool communicating through a wand and a suction hose to a recovery tank in the vacuum cleaner. Hot cleaning solution, held in a supply tank or reservoir mounted on the wand,...http://www.google.es/patents/US4329756?utm_source=gb-gplus-sharePatente US4329756 - Hot water extraction carpet and floor cleaning machine
Hot water extraction carpet and floor cleaning machine
