Combined Cipher Machine

The Combined Cipher Machine (CCM) (or Combined Cypher Machine), dating from 1942, was a common cipher machine system for securing Allied communications during World War II and for a few years after amongst NATO. The British Typex machine and the US ECM Mark II were both modified so that they were interoperable.
More information on the Wikipedia page and the Crypto Museum page . National Security Agency document here and Center for Cryptologic History article here. Some images here. 
Category:20th century
Category:Ciphers