"Rockex" was named after the Rockefeller Center, together with the tradition for naming British cipher equipment with the suffix "-ex" (e.g. Typex).

In 1944 an improved Rockex II first appeared. There were also a Mark III and Mark V. After the war it was used by British consulates and embassies until 1973, although a few continued in use until the mid-1980s.

After WW2 the Rockex machines and the code tapes were manufactured in great secrecy under

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