Riedel diversified in 1885 into coal mining in the region of Hostomitz, 150 km west from the factory – the coal was not used for glass manufacturing but sold for other use. In the same year the Riedels widened their hemp manufacturing by acquiring a rope- and cable-making factory. It sold its finished goods through wholesalers to the world market. Expansion continued in 1886 with an additional glass factory in Stefansruh. The new factory was dedicated to glass rods and tubes, which replaced the production of the shut down Klein Iser factory. In 1886 the central administrative office was established in Polaun, which became the Jos. Riedel company headquarters.