Braille typewriter.
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Previously:
https://www.homemadetools.net/forum/...782#post183116
https://www.homemadetools.net/forum/...103#post164990
https://www.homemadetools.net/forum/...346#post122023
https://www.homemadetools.net/forum/...253#post169183
https://www.homemadetools.net/forum/...243#post188381