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BTW Elliot had quite interesting memory design: https://en.wikipedia.org/wiki/Delay_line_memory

Ferranti Pegasus used the same (and it's still up and running!): http://www.sciencemuseum.org.uk/images/I039/10307498.aspx

Also used on the Elliott 803, but the 4100 series used .050 core memory, hand-woven.