The first generation photocopiers were around in 1960. That summer I was chained to one of those in an advertising agency. It was a "wet" copier using harsh chemicals. The copies came out wet and had to be laid out singly to dry so they would not either smear or stick together.
The dry copiers which were electrostatic rather than chemical came out maybe four years later. From then to now its been refinements rather than quantum leaps in copiers, except for the jump to color copies.
Congressman Billybob