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The first Intel® 4004 microprocessor was produced on two-inch wafers compared to the 12-inch wafers commonly used for today's products. The Intel 4004 microprocessor is unique in that it is one of the smallest microprocessor designs that ever went into commercial production.
https://www.intel.com/content/www/us/en/history/museum-story-of-intel-4004.htm
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