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Professional 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

Correspondence, minutes, reports, documents, scrapbooks, publications, memorabilia, and photographs. The general files, minutes, and reports reflect the varied activities and interests of the League, including apportionment, court reform, education, and voting rights. The historical files contain photographs, printed materials, and memorabilia, filed chronologically. Also included are the periodicals and publications of the League, scrapbooks arranged chronologically, and "Mailbooks", or volumes of mimeographed reports and announcements which were sent to branches and board members. Among the major correspondentrs are: Thomas E. Dewey, Herbert H. Hehman, Nelson A. Rockefeller, Franklin D. Roosevelt, and Alfred Smith

Correspondence, manuscripts, documents, photographs, memorabilia, and printed materials. Correspondence is both professional and personal, relating primarily to Fuld's duties in the New York District Attorney's Office, as a judge in the state and federal courts, and to his civic work for the Jewish Theological Seminary, the City College of New York, New York University, and the Columbia University Law School. Major correspondents include: Thomas E. Dewey, Louis Finkelstein, Herbert Lehman, and Nelson A. Rockefeller. The rest of the collection consists of Fuld's briefs, opinions, memoranda, forms of indictments, appeals cases, reports for the New York State Court of Appeals from his appointment in 1946 through 1973, and manuscripts of his speeches and lectures. The memoranda series deals chiefly with investigations into organized crime. In addition there are biographical materials, memorabilia, and photographs.