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The First Transistor Calculator
October 7, 1954 IBM researchers modify an existing model 604 vacuum tube calculator to use transistors. This experiment didn’t shrink the desk-sized machine nor make it any faster, but it did use only 5% of the power the vacuum tube-based design did. Encouraged by this successful experiment, IBM introduced the first commercial transistor calculator 4…
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Transistor Patented
October 3, 1950 AT&T Bell Laboratories researchers John Bardeen, Walter Brattain, and William Shockley receive a US Patent for their invention of the transistor, which they had successfully demonstrated two years earlier. The transistor completely revolutionized the development of electronic and computerized technology. Previous post: ENIAC Retired This Day in Tech History