In 1951, the Austrian horn comb maker Friedrich Petz was the last of his guild to receive the master craftsman's certificate, but his guild was dissolved in the years that followed and comb making was declared a free trade. As a result, and with the increasing number of industrially produced combs made of hard rubber and plastic, the number of horn comb makers steadily decreased. The Hornmanufaktur Petz in Vienna is one of the few that still produces combs, brushes and hair clips from the natural material by hand, this since 1862. The knowledge of manual processing is passed down from generation to generation, today the grandson of said horn comb maker master runs the business and manufactures on the machines of the grandfather.