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...[[cryptology]] course conducted by the [[Polish General Staff]]'s [[Biuro Szyfrów|Cipher Bureau]], which he joined full-time in 1932. The Bureau had achieved ...olish General Staff]]'s [[Biuro Szyfrów|Cipher Bureau]] (''{{lang|pl|Biuro Szyfrów}}'').<ref>The course began on 15 January 1929. A letter dated "[[Warsaw]], ...