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Photographs (positive and negative), slides, and transparencies taken by the company's photographers to document company activities, products, services, employees at work and at leisure, company exhibits and commemorations, and the response of the company to natural disasters and civil disturbances.

In 1993, Michigan Bell as a corporate entity was subsumed within the Ameritech Corporation. As a by-product of this reorganization and the downsizing resulting from it, the company agreed to deposit with the Bentley Historical Library its extensive archive of photographic images. Totalling approximately one million images, the Michigan Bell Telephone Company photo archive consists of negatives, copy prints, and color transparencies taken in the period since World War II (the bulk beginning in 1949). The collection does not include photos taken since 1983; interspersed throughout, however, are numerous images from before 1949.

The collection has been maintained in the order received with two principal series: Positives and Negatives.

The content of the photographs in the two series varies considerably. Naturally the collection documents the products of the company (phones and other communication devices) and the services provided (e.g. employees at work or the company reacting to a specific customer need). These photos were taken both to inform the general public as accompaniment to press notices and advertising copy and as a communications vehicle within the company, informing employees through the company news publication, Tielines, of activities going on in other divisions of the company or among the various regional Bell offices.

More importantly perhaps, the collection has value for its documentation of events and activities that are common to all large companies. These include images relating to: 1. The activities of employees within the corporation at their work (office workers, repairmen, operators, various support personnel, managers, etc.); 2. The activities of employees outside their work routine as members of corporate social groups (i.e., the company baseball or ice hockey team), at home engaged in leisure time activities, or involved in company-sponsored charitable or public service functions; and 3. Commemorations of specific milestones or events (company parade floats, area office open houses, corporate displays at public events such as fairs, etc.).

In addition, the collection documents the extraordinary and unforeseen as the phone company reacts to events and emergencies not within its control (floods, tornadoes, fires, the 1967 Detroit riot, strikes, and the like) or as a participant in history-making events (the announcement in Ann Arbor of the success of the Salk polio vaccine or the preparation involved in the 1980 Republican National Convention that convened in Detroit).

Michigan congressman and senator, head of the U.S. Office of Price Administration; papers include correspondence, legislative files, speeches, political files, business and legal records, diaries and scrapbooks, visual materials, and sound recordings.

The Prentiss M. Brown Collection is rich and full and offers researchers materials on a variety of local and national topics reflecting the diversity of the man's private and public life. The earliest item in the collection is a letter book dated 1902-04 of James J. Brown, like his son a prominent St. Ignace attorney. The collection then picks up Prentiss M. Brown's entrance to the legal profession in 1917, traces his rise to public office, his work in Congress and with the O.P.A., and then concludes with his later business interests and his crusade upon behalf of the Mackinac Bridge.

The Brown Collection comprises approximately twenty-eight feet of correspondence, letterbooks, scrapbooks, diaries, speeches, topical and legislative files, photographs and phonograph records, and legal case files and business records. Covering the period 1917 to 1973, the papers concentrate most heavily in the years 1932-1942 when Brown was in the U.S. Congress. The greatest gap in the collection is in the period of the 1920s when Brown was making his first bids for political office. Also missing are any extensive files for the time of Brown's O.P.A. directorship. What the collection has on the O.P.A. are largely speeches, scrapbooks, and congratulatory letters.