We don't see many of those any longer, what with computers doing much of that work, but several decades ago every office and many homes had at least one typewriter and a stash of carbon paper and a couple of bottles of liquid paper.
The Parish Typewriter Service ad from the 1946 phone book
This business was a mainstay in the community, keeping the businesses and government offices humming with typewriter repair services and the never-ending supply of typewriter ribbon. (Remember the two-color kind: red and black on the same ribbon?) This was even before photocopiers, tele-copiers, self-correcting IBM Selectrics and facsimile machines. Now having said that I know some younger folks are wondering, just what the heck is he talking about?