| http://www.w3.org/ns/prov#value | - The apparatus of the present invention, such as a heat exchanger, comprises an endless pipe and is characterized in that the endless pipe has a bent form, such as to allow the cleaning member or members to circulate constantly within the pipe, passing the outlet and the inlet (each or either of which may be formed as a nozzle) and being pushed forward by a liquid entering under pressure.
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