Other encryption devices were produced and during this same time period. The same time period. The U.S. government's "Big Machine" looks like an early typewriter on steroids.This machine, officially known as the Sigaba, is the only known encryption machine whose code was not broken during World War II. Other machines are the Typex, designed for secure communications between the British and the Americans, the American Tunney and Sturgeon machines, which were capable of booth encrypting and transmitting, and the Japanese Purple and Jade machines.
These machines, or parts of them, can be seen at the National Security Association Museum.