| 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.
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| Date | |
| Source | Larousse mensuel illustré, 1911 (https://archive.org/stream/laroussemensueli02auguoft#page/163/mode/1up) |
| Author | Anonymous engraver |