a surface by rolling the seal on wet clay. Typography was also implemented in the Phaistos Disc, an enigmatic Minoan printed item from Crete, which dates to between 1850 and 1600 B.C. It has been proposed that Roman lead pipe inscriptions were created with movable type printing, but German typographer Herbert Brekle recently dismissed this view. The essential criterion of type identity was met by medieval print artifacts such as the Latin Pruefening Abbey inscription of 1119 that was created by the same technique as the Phaistos Disc. The silver altarpiece of patriarch Pellegrinus II (1195–1204) in the cathedral of Cividale was printed with individual letter punches. Apparently, the same printing technique may be found in tenth to twelfth century Byzantine reliquaries. Other early examples include individual letter tiles where the words are formed by assembling single letter tiles in the desired order, which were reasonably widespread in medieval Northern Europe. Typography with movable type was invented during the eleventh-century Song dynasty in China by Bi Sheng (990–1051). His movable type system was manufactured from ceramic materials, and clay type printing continued to be practiced in China until the Qing Dynasty. Wang Zhen was one of the pioneers of wooden movable type. Although the wooden type was more durable under the mechanical rigors of handling, repeated printing wore the character faces down and the types could be replaced only by carving new pieces. Metal movable type was first invented in Korea during the Goryeo Dynasty, approximately 1230. Hua Sui introduced bronze type printing to China in 1490 AD. The diffusion of both movable-type systems was limited and the technology did not spread beyond East and Central Asia, however. Modern lead-based movable type, along with the mechanical printing press, is most often attributed to the goldsmith Johannes Gutenberg in 1439. His type pieces, made from a lead-based alloy, suited printing purposes so well that the alloy is still used today. Gutenberg developed specialized techniques for casting and combining cheap copies of letter punches in the vast quantities required to print multiple copies of texts. This technical breakthrough was instrumental in starting the Printing Revolution and the first book printed with lead-based movable type was the Gutenberg Bible. Rapidly advancing technology revolutionized typography in the latter twentieth century. During the 1960s some camera-ready typesetting could be produced in any office or workshop with stand-alone machines such as those introduced by IBM (see: