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WALTER WHEAL
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WALTER WHEAL
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Application filed by WALTER WHEALfiledCriticalWALTER WHEAL
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Publication of FR396865ApublicationCriticalpatent/FR396865A/fr
F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION