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Eugene McLean Long of Washington D.C. invented this pocket typewriter, though, in his original 1900 patent he referred to it as a "Pocket Recorder." The user would use it with just one hand to type coded messages with its 4 keys. The typewriter was produced by the Long and Callaghan company. However, the October, 1920 issue of Typewriter Topics stated that the typewriter had 5 keys and that it was produced by Clean, Long and Callaghan.
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