Giant Industrial Frequency Heat-Treatment Equipment, People's Republic of China, 1968 -- Daily LIFT #1919 From the Chinese press, 1968: A hundred-ton rolling-mill roll standing high as a two-storey building and so big that four men can touch outstretched arms around it, moved along swiftly on an overhead travelling crane and dropped easily into the opening of the heat-treatment tower. As red and green lights on the control panel flashed, the giant roll was rapidly turned, to
