When he retired in 2000, Mr. Tytell had practiced his recently vanishing craft for 70 years. For most of that time, he rented, repaired, rebuilt, reconfigured and restored typewriters in a second-floor shop at 116 Fulton Street in Lower Manhattan, where a sign advertised “Psychoanalysis for Your Typewriter.”

There, at the Tytell Typewriter Company, he often worked seven days a week wearing a white lab coat and a bow tie, catering to customers like the writers Dorothy Parker and Richard Condon, the newsmen David Brinkley and Harrison Salisbury, and the political opponents Dwight D. Eisenhower and Adlai E. Stevenson. Letters addressed only to “Mr. Typewriter, New York” arrived there, too.