Never new this existed.
I have shared this in the chit chat section too, but thought it was appropriate for the vintage section. The Berlin Museum of Technology is one of the great places I was able to visit with my dh & ds last week. There were displays of several old machines, including 3 machines hooked together to be operated at once, set to embroider in the hoop, pattern determined by a scroll of punched paper. Cool! What ingenuity.