In 1950, a publicity photographer took a picture of guitarist virtuoso and recording engineer Les Paul (at right) with his wife, popular vocalist Mary Ford, as they were given a tour of the 3M Company. They are examining a web of tape that will be later be slit into the required widths needed for recording.
At that time, it was the mostly 1/4"- and 1/2"- (inch) reels that were used; the lager formats came later. Les Paul remembers the tour around the "campus," seeing how tape was manufactured. The 3M executive (at left) that is showing them around has had his name lost both by the company and by Les Paul.