The First Commercial Fully Transistorized Calculator
In April 1955, IBM announced the IBM 608 transistor calculator which was first shipped in December 1957. IBM and several historians thus consider the IBM 608 the first all solid-state computing machine commercially marketed. The development of the 608 was preceded by the prototyping of an experimental all-transistor version of the 604. This was built and demonstrated in October 1954, but was not commercialized.
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—J.G. (James Graham)
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