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Similar machines have been in use for a long time to sign letters https://en.wikipedia.org/wiki/Autopen https://en.wikipedia.org/wiki/Autopen : US presidents (a
by leoc 12y ago
Similar machines have been in use for a long time to sign letters https://en.wikipedia.org/wiki/Autopen https://en.wikipedia.org/wiki/Autopen : US presidents (and LDS presidents) have long been fond of them. Presumably extending their use to whole handwritten letters is newer.
Then there's something even older: https://www.youtube.com/watch?v=laJX0txJc6M https://www.youtube.com/watch?v=laJX0txJc6M