For many years, the word “mouse” commonly evoked thoughts of Mickey. But that association began to be eclipsed on this date in 1981 when the Xerox Corporation, then a major developer, introduced the mouse to the commercial computing world. Its 80-10 information system — with the mouse — didn’t catch on, mostly because it cost $20,000. But the mouse itself roared elsewhere in the computer industry and is still holding its own. Today, computer manufacturing is a nearly $10 billion a year business for 360 establishments in the country, along with some 625 others making peripheral equipment and items valued at over $11 billion annually. Together, they employ some 43,000 workers. You can find current data on the country’s economy by downloading the ‘America’s Economy’ mobile application at <www.census.gov/mobile>.