| http://www.w3.org/ns/prov#value | - 78Bergwerksverband GmbhMethod for closing off a mine gallery especially for use to prevent spreading of underground explosionsUS410737627 May 197615 Ago 1978Takashi IshikawaPorous core coated or impregnated with inorganic material capable of foaming when heatedUS411301416 May 197712 Sep 1978Bayer AktiengesellschaftPolyurethanesUS41196027 Abr 197710 Oct 1978W. R. Grace & Co.Aqueous urethane codispe
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