Bell Telephone Company was a telecommunications company that led the Bell System of telephone services throughout North America between 1877 and 1983. This small collection of photographs documents the company's line-laying equipment and process; several images show workers driving tractors, digging trenches, and laying telephone lines. These images would be of interest to scholars of the history of technology and early telecommunications.

The papers of Bert Sheffield document his life and work to advance the science of electronics, specifically relating to computer engineering and telecommunications. It includes internal correspondence, performance data and notes, journal articles and reprints, meeting notes, product catalogs and RCA employee benefits policies.

Carl George Dietsch (1900-1978) was an electrical engineer who specialized in shortwave radio transmitters. He supervised the construction of radio stations for the Radio Corporation of America (RCA) and the National Broadcasting Company (NBC) from the 1930s to the 1960s, including locations in Brazil, Argentina, the Philippines, Japan, and Morocco. This collection consists of materials relating to Dietsch’s projects for RCA and NBC, particularly concerning the construction of a radio station in Tangier, Morocco, as well as the World War II Voice of America project in Dixon, California. The bulk of the collection material spans from the 1920s to the 1960s, with some later material from Dietsch’s time as a private engineering consultant. The collection includes correspondence, patent material, trade catalogs and publications, manuscript material, photographs and negatives, blueprints, diazotypes, audiovisual material, and drafting tools. This collection would be useful to researchers interested in shortwave radio station construction.

Charles Jennings (1916-2006) served for more than forty years as RCA Global Communications’ primary liaison in Japan, figuring prominently in the development of post-World War II Japanese communications systems. The collection consists primarily of black and white and color photographs, albums, advertising posters, papers, and unbound scrapbook boards of photographs and ephemera. The images predominantly relate to Jennings’ business and personal life during his time in Japan, addressing the themes of Japanese and trans-Pacific telecommunications activities, particularly relating to RCA; postwar Japanese-American business and informal diplomatic relations; and life in postwar Tokyo.

World's Fairs, also known as International Expositions, are large-scale exhibitions that highlight technology, agriculture, and other innovations of national or cultural significance. The Century 21 Exposition, also known as the Seattle World's Fair, ran from April 21 to October 21, 1962. It began as an effort by Seattle city councilman Al Rochester (1895-1989) to revitalize the downtown core and recreate the success of the city's Alaska-Yukon-Pacific Exposition of 1909. It evolved within a few years under the direction of general manager Ewen Dingwall (1914-1996). He changed the initial "Festival of the West" theme to "America's Space Age World's Fair." This item is a first edition souvenir commemorative album documenting the first transcontinental telephone call via the groundbreaking Telestar Satellite from U.S. Senator Warren G. Magnuson (1905-1989) and Senator Robert Kerr (1896-1963), calling Washington State Governor Albert Rosellini (1910-2011) and Ewen Dingwall from atop the newly constructed, 600-foot-high Space Needle.

Isaac "Ike" Aaronson (1875-1962) was a division construction superintendent for the Bronx Division of the Bell Telephone Company. In this role, he supervised the relocation and splicing of cables in subways, rapid transit, and across bridges. Bell Telephone Company was a telecommunications company that led the Bell System of telephone services throughout North America between 1877 and 1983. This scrapbook primarily focuses on Aaronson's Testimonial Dinner, which was held on April 7, 1938, after he retired from the company after forty-five years. The contents include magazine and newspaper clippings about Aaronson's career and the Testimonial Dinner, telegrams and correspondence sending regrets for being unable to attend the dinner and felicitations on his retirement, a dinner menu, and event photographs. The remainder of the album consists of materials documenting Aaronson's career at the telephone company.

MCI Communications Corporation (MCI) was a large telecommunications company. It was organized in October 1963 in Joliet, Illinois, by John D. (Jack) Goeken (1930-2010), as Microwave Communications, Inc. Goeken and his partners were planning to provide point-to-point private line microwave communications between Chicago and St. Louis to small businesses. This large collection documents the activities of the MCI Communications Corporation and its subsidiaries as well as the development of a competitive telecommunications industry in the United States and worldwide. The materials focus on MCI corporate life, public relations, technical operations, and sales and marketing activities. A vast amount of videotapes makes up a significant portion of the MCI collection, however, there are also photographs, slides, digital files, and audio cassette tapes.

MCI Communications Corporation (MCI) was one of the largest telecommunications companies in the world. It was incorporated in Delaware in 1968 as Microwave Communications of America, Inc., to provide businesses with nationwide microwave telecommunications services at low prices. Being confronted by industry de facto monopoly AT&T in the interconnection of its lines to local facilities owned by AT&T affiliated regional Bell companies, MCI challenged the telecommunications giant with competitive long-distance telephone services, both in courts and at the marketplace. MCI-AT&T antitrust litigation (1974-1985) led to AT&T's divestiture of its regional carriers and changed the previously regulated telecommunications industry into a business open to competition. The collection documents all facets of MCI history from 1968 to the end of the 1990s, as well as changes in the American telecommunications regulatory policy, legislation, and public perception of the industry. Documents also include records of MCI's subsidiaries and their predecessors starting as early as 1849.

MCI Communications Corporation (MCI) was a large telecommunications company. It was organized in October 1963 in Joliet, Illinois, by John D. (Jack) Goeken (1930-2010) as Microwave Communications, Inc. Goeken and his partners were planning to provide point-to-point private line microwave communications between Chicago and St. Louis to small businesses. This small collection of MCI documents primarily concerns customer service support, branch service, billing/system problems, and internet services.

The Telecommunications series contains images of equipment, components, parts, and details. The series is arranged into six subseries: Equipment, Facsimile equipment, Mobile, Speech, Telephones, and TELEX. The materials date from 1930 to 1977.