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  BletchleyPark_TNMOC 093.jpg - The Colossus ran 24/24 and 7/7; the original machines were never powered off completely, as the valves held longer if their filaments were constantly hot and not subjected to the thermal stress associated with the ON/OFF procedure.  
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The Colossus ran 24/24 and 7/7; the original machines were never powered off completely, as the valves held longer if their filaments were constantly hot and not subjected to the thermal stress associated with the ON/OFF procedure. Download
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