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Edwin H. Armstrong papers, 1886-1982, bulk 1912-1954
295.7 linear feetProfessional and personal files including Armstrong's correspondence with professional associations, other engineers, and friends, his research notes, circuit diagrams, lectures, articles, legal papers, and other related materials. Of his many inventions and developments, the most important are: 1) the regenerative or feedback circuit, 1912, the first amplified radio reception, 2) the superheterodyne circuit, 1918, the basis of modern radio and radar, 3) superregeneration, 1922, a very simple, high-power receiver now used in emergency mobile service, and 4) frequency modulation - FM, 1933, static-free radio reception of high fidelity. More than half the files concern his many lawsuits, primarily with Radio Corporation of America, over infringement of the Armstrong patents. Litigation continued until 1967. Other files deal with his work in the Marcellus Hartley Research Laboratory at Columbia University, 1913-1935, and with the American Expeditionary Forces in France during World War I, his Air Force contracts for communications development, Army research during World War II, the Radio Club of America, the Institute of Radio Engineers, FM development at his radio station at Alpine, N.J., the use of FM in television, his involvement in Federal Communications Commission hearings and legislation, and his work with the Zenith Radio Corporation. Also, letters to H.J. Round
Greenberg Publisher records, 1894-1976
76 linear feetThe surviving editorial, production, and publicity files of Greenberg: Publisher. The Greenberg: Publisher library includes 462 titles published by the firm. Also, personal papers of Jacob Walter Greenberg consisting of letters, manuscripts, photographs, clippings, printed ephemera, and memorabilia. These are biographical in nature relating to Greenberg, his family, friends, business associates, authors, politicians, and other public figures. Among the letters are one each from public figures including Robert Benchley, Bennett Cerf, Fiorello La Guardia, and Eleanor Roosevelt.