One runs across occasional remarks concerning working patterns which don't quite seem to fit anywhere (yet). Some of these identify entire manufacturing processes not yet described. Here are those I've found so far.
In their 1916 Typographical Printing Surfaces, Legros and Grant write:
"A few of the formers [= working patterns], such as the mathematical signs, can be conveniently made on ordinary machine-tools out of two thicknesses of metal riveted together, but for the majority one of the other methods described is generally employed." (p. 212)
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