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Publication of GB1265216ApublicationCriticalpatent/GB1265216A/en
E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
E04F17/00—Vertical ducts; Channels, e.g. for drainage
E04F17/02—Vertical ducts; Channels, e.g. for drainage for carrying away waste gases, e.g. flue gases; Building elements specially designed therefor, e.g. shaped bricks or sets thereof
Sistema igienico-ecologico per prevenire l'inquinamento dovuto alliquame dei suini e sfruttamento dello stesso con l'estrazione del gas metano biologico
Einrichtung zur Herstellung von Rohren, insbesondere Rohren großen Durchmesser, aus einer wässerigen Mischung von Fasern, vorzugsweise Asbestfasern und einem Bindemittel, vorzugsweise Zement