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Beginning with the invention of the offset technique, the 20th century saw the steady development of innovations in the direction of mass production, speed, and economy. At the same time, lithography was undergoing a new evolution. After the first mechanical presses had been perfected, this process had developed along two lines: (1) printing on thin sheets of metal (for example, tinplate for packaging canned foods) using a transfer process (1878) in which the impression cylinder carrying the metal sheet to be printed did not come in contact with the stone but did with an intermediary cylinder covered with rubber, the ...(100 of 26569 words)