Page:Preliminary Historical Report on the Solution of the "B" Machine.pdf/1

 REF ID:A58137

PRELIMINARY HISTORICAL REPORT ON THE SOLUTION OF THE "B" MACHINE*


 * After 23 October 1940 this machine was, for security purposes designated as the "Purple System." WFF

Declassified and approved for release by NSA on 08-14-2013 pursuant to E.O. 13526