File:Comparison of Full-Keyboard, Single-Shift, and Double-Shift Typerwriters in 1911.png

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Description
English: Fig. 1: Machines with one character per key. Fig. 2: Machines with two characters per key. Fig. 3: Machines with three characters per key.
Date
Source Larousse mensuel illustré, 1911 (https://archive.org/stream/laroussemensueli02auguoft#page/163/mode/1up)
Author Anonymous engraver

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Public domain
This work was published before January 1, 1929 and it is anonymous or pseudonymous due to unknown authorship. It is in the public domain in the United States as well as countries and areas where the copyright terms of anonymous or pseudonymous works are 95 years or fewer since publication.

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