They are a familiar sight to everyone: concrete blocks in various shapes and colors, used as paving stones and grass paving blocks, masonry blocks and hollow blocks, palisades or curbstones. Less familiar, however, are the sophisticated machines that manufacturer them in long strips with very high precision and speed, and stack them in multiple layers for curing. One of the best-known fully automatic, mobile multilayer production machines comes from Neunkirchen near Siegen in North Rhine-Westphalia, Germany: The Zenith 940 has been continuously refined since the 1960s and has now undergone a fundamental technological overhaul thanks to a comprehensive hydraulics update from Bosch Rexroth.