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Publisher Summary This chapter focuses on rapid growth in the field of microelectronics. It is not so long since the first solid circuits were made in this country, and from the experimental circuits of 1956–1957, progress has been made to the stage where today 15 or 16 firms not only making microelectronic circuits, but willing to sell them. There are two reasons for tremendous pace of development, first the increasing complexity of modern electronic equipment, particularly computers. There is a data handling computer at RRE, which now uses four million components some thought has been given to another which may contain 15 to 20 million components. There are many cases where high powers are concerned where hybrid construction must be used, certainly for the next few years. There are many applications coming forward and large orders are now required by industry to reduce prices. In the United States, it is considered that microelectronics will be used commercially in radio and television by 1965.