Photocopying

Carlson worked on his method for twenty years and finally perfected it for office use, reduceing dependency on cumbersome traditional methods. Photocopying revolutionized document replication using dry powder and electric charge.
 Chester F. Carlson United States 1958 Photocopying

Carlson worked on his method for twenty years and finally perfected it for office use, reduceing dependency on cumbersome traditional methods. Photocopying revolutionized document replication using dry powder and electric charge.