World War II Navy Radio
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Communications Typewriter

Underwood Communications Typewriter

Mill Keyboard

The communications typewriter, known to Radiomen as a "mill" has special features to facilitate the work of Radiomen and other communications personnel. 
In plain language, context would help distinguish between similar characters such as 0 and O.  The mill has a slashed zero to differentiate zero from capital O, because most traffic was enciphered and letters and numerals were mixed together in groups.   The mill also has a 1 key, whereas on other typewriters of the era, you typed a small l to represent the numeral 1.  The 1 key eliminated the necessity of using the shift key to make a 1.  The punctuation symbols correspond to different numerals on the mill because of the numeral 1 taking the normal location of the numeral 2.