Technological advances proceeded in a range of areas. Watermills to grind grain had existed during most of the Anglo-Saxon period, using horizontal mill designs; from the 12th century on many more were built, eliminating the use of hand mills, with the older horizontal mills gradually supplanted by a new vertical mill design. Windmills began to be built in the late 12th century and slowly became more common. Water-powered fulling mills and powered hammers first appeared in the 12th century; water power was harnessed to assist in smelting by the 14th century, with the first blast furnace opening in 1496. New mining methods were developed and horse-powered pumps were installed in English mines by the end of the Middle Ages. The introduction of hopped beer transformed the brewing industry in the 14th century, and new techniques were invented to better preserve fish. Glazed pottery became widespread in the 12th and 13th centuries, with stoneware pots largely replacing wooden plates and bowls by the 15th century. William Caxton and Wynkyn de Worde began using the printing press during the late 15th century. Transport links were also improved; many road bridges were either erected or rebuilt in stone during the long economic boom of the 12th and 13th centuries. England's maritime trade benefited from the introduction of cog ships, and many docks were improved and fitted with cranes for the first time.