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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).

The Thomas Francis Jr. collections consists of the personal and professional papers of one of the developers of the influenza and poliomyelitis vaccinations. Francis taught epidemiology at the School of Public Health and medical school from 1941 to 1969 and greatly influenced the direction of research in his field.

Important certainly for the study of influenza and poliomyelitis research, the Francis papers also document changes in the way scientific research, particularly medical research, was managed. In his correspondence files, the records from his work in combating influenza and poliomyelitis, and his participation in various professional societies, the researcher will find Francis interacting as a member of a scientific community, working with others, soliciting and exchanging views, and administering, when needed, vast programs of testing.

The Thomas Francis, Jr. papers have been arranged into seven series: General; Correspondence; Poliomyelitis Vaccine Evaluation Center; Organizations; University of Michigan; Speeches, Articles, etc.; Topical Files; and Personal/Biographical. Specific topics covered in the collection are mentioned in the descriptions of individual series. In sum, the collection documents more thoroughly Francis' work since coming to the University of Michigan in 1941. Francis' fame rests upon his research and his heading-up of influenza and poliomyelitis testing programs. For some topics, use of the Francis papers will require of the researcher at least a basic level of knowledge of epidemiology or disease control. Other subjects, such as the administration of research projects and the ways in which information is transmitted within the scientific community are less specialized and capable of being understood by the informed layperson.

Parts of the Francis papers have not yet been completely processed. Most of these subseries pertain to Francis' organizational commitments and to his membership on various boards and commissions. Types of records in these unprocessed subseries consist of minutes of meetings and procedural records. These unprocessed records are indicated on the finding aid along with the bulk size of the subseries.