1.8 linear feet (ca. 3,600 pp.)
This collection consists of two series--one concerning Filmsort both before and after its acquisition by 3M and the other relating to other aspects of 3M's involvement in microfilm work.
The Filmsort Series contains sales information, price lists, equipment photographs, correspondence, memoranda, patents, product brochures, parts lists, equipment operating and service manuals, and newsletters. The bulk of this material pre-dates the sale of Filmsort to 3M. The folder of John Favorite and Charles Hann correspondence and memoranda is a file maintained by 3M about Filmsort, but many of the other materials were originally part of the records of the Filmsort Company and were acquired by 3M along with the other assets of Filmsort in 1959.
The 3M series contains newsletters, parts and service manuals, technical notes for customer service representatives, "know how" bulletins, and a camera marketing manual. These materials concern 3M microfilm work and products not specifically identified with the Filmsort division. The bulk of this series dates from 1958 to 1968 although two folders date from 1976.