The method used to print the labels on top of the cards is rather fascinating, as well, and involves a mechanical bit store for the matrix font. (No electronics

The method used to print the labels on top of the cards is rather fascinating, as well, and involves a mechanical bit store for the matrix font. (No electronics involved, all electro-mechanical.) https://www.masswerk.at/misc/card-punch-typography/ https://www.masswerk.at/misc/card-punch-typography/