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Publication of NO792894LpublicationCriticalpatent/NO792894L/no
Publication of NO146152BpublicationCriticalpatent/NO146152B/no
Publication of NO146152CpublicationCriticalpatent/NO146152C/no
Fremgangsmaate ved avising av i et ventilasjonsanleggs avluftkanal anordnet varmeveksler for varmegjenvinning og apparat for fremgangsmaatens utfoerelse