4 · Society, Civilization, Culture
47 · crafts and industries
47C · industrial processes, handling of materials
47C5 · smoothing, polishing, etc. (industrial processes)
47C52 · consolidating (industrial process)
47C521 · pressing (industrial process)
47C521(+4) · pressing (industrial process) (+ materials processed ~ crafts, industries, agriculture)
47C521(+44) ·
pressing (industrial process) (+ plant material ~ crafts, industries, agriculture)