HP Decimal Counter and Decade Divider, vacuum tube-based circuits (1963-1964)
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HP vacuum tube based decimal counter, circa 1963 (above).
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HP Decade Divider 1964 (above).
History of Computing
An Encyclopedia of the People and Machines that Made Computer History
Copyright © 1982-2000, Lexikon Services "History of Computing" ISBN 0-944601-78-2
