How does an Addressograph Multigraph work?

Addressograph Multitgraph are two different types of machines. The Addressograph is a machine that would be used to address envelopes for repetitive mailing lists. The machine would address envelopes from a metal plate which was embossed with the name and address just as a credit card is today. The metal plate plate was embossed on a Graphotype machine using a fairly standard keyboard, stamping each letter on the plate individually. The Multigraph was used for making copies of a letter. Metal Type was set on a cylinder on the machine and ink applied to the type and paper run through through a pressure roller which printed the sheet. This was done at speeds up to 6000 per hour. Great speed in those days. Later the Multilith was invented. In this process the letter was photographically produced on a large metal plate which allowed photographs also to be run. That is a very simple explanation of the questions. There is the Addressograph, the Graphotype, the Multigraph and the Multilith. Hope that helps.