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  BletchleyPark_TNMOC 082.jpg - As the original memory was built using mercury delay lines, the restoration crew switched to magneto-restrictive delay lines (similar to those used in the Friden 132 or the Olivetti Programma 101).  
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As the original memory was built using mercury delay lines, the restoration crew switched to magneto-restrictive delay lines (similar to those used in the Friden 132 or the Olivetti Programma 101). Download
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