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Heinrich Rudolf
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10,237. Rudolf, H. May 11. Pottery.-Ornamental metallic printing on glass and like surfaces is moistened with hydrochloric acid, after firing, to render the pattern more distinct.
GB190810237D1908-05-111908-05-11Improvements in and relating to Metal Printing on Glass and like Surfaces.
ExpiredGB190810237A
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An "Azarola" process to cover with a uniform, solid and adherent layer, made up of metallic opids, ferrous metal or alkaline earth metal (rare earth) oxide of pure metals or of metal oxide in the respective proportions that are convenient.