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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, outlines and drafts, manuscripts, letters of agreement, contracts, photographs, artwork, and memorabilia. The collection is divided into two parts: the Frederic Dannay papers and the files of ELLERY QUEEN'S MYSTERY MAGAZINE (EQMM). The Dannay papers consist of extensive correspondence with most of the notable mystery writers of this century, as well as well-known authors who sometimes wrote in that genre: Isaac Asimov; Lawrence Block; Ray Bradbury; Pearl S Buck; Edgar Rice Burroughs; James M. Cain; Raymond Chandler; Agatha Christie, etc. Most of the novels and short stories written by Dannay and Lee are represented in manuscript form: "The Roman Hat Mystery;" "Ten Day's Wonder;" "Cat of Many Tails;" "The Scarlet Letters;" "The Glass Village;" "The Player on the Other Side;" "And on the Eighth Day" etc. In addition, there are the manuscripts of books edited by Ellery Queen; manuscripts by Ellery Queen Jr.; scripts by Ellery Queen; poetry by Dannay; contracts between Dannay and Lee, as well as between them both as Ellery Queen and numerous parties. There are also manuscripts by such notables as Jorge Luis Borges; Erskine Caldwell; Raymond Chandler; Agatha Christie; Stanley Ellin; William Faulkner; Dashiell Hammett; O Henry; Nigel Morland; Georges Simenon; Muriel Spark; Julian Symons; Roy Vickers; and Cornell Woolrich.