DF-120 ‘Report on the solution of messages in depth of the American cipher device M-209’ , 1948. It is a translation of a German document from the OKH/GdNA archives describing the American M-209 cipher machine and its method of solution. Very interesting file!
DF-114 ‘German Cryptanalytic device for solution of M-209 traffic’ ,1948. It is a translation of a German document from the OKH/GdNA archives describing a cryptanalytic machine used to decode M-209 messages.
I have to thank Randy Rezabek for giving me the location of these files.