This is one of a series of photographic material in print, negative and/or digital formats covering CSIRAC machine and the people associated with it. The series was acquired from the University of Melbourne in 2003.

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Head shot of Reg Ryan, possibly 1950s. Reginald Ryan designed and built the primary memeory store of the CSIRAC computer. Image collected for inclusion in the book 'The Last of the First', published 2000. A biography appears on pages 32 to 33.

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