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Series IV: Alphabetical Files, 1886-1980
This series is comprised of a large set of files which appears to have been Armstrong's filing system, which was expanded upon at a later date to include litigation, the Armstrong Memorial Research Foundation Files, and others. This series is organized alphabetically by both name and subject.
Throughout the series there are folders which are filed by individual name. The majority are engineering publications, filed by author. Others contain legal statements, testimony, correspondence and memoranda.
There are also large sets of litigation files, which contain material relating to specific cases, generally filed by defendant. These files contain testimony, transcripts, abstracts, notes, disclosures, technical reports and papers, license agreements, articles, press releases, correspondence, legal memoranda, instruction manuals, exhibits and patent file wrappers. Large amounts of Armstrong's and relevant others original work including correspondence, diagrams, notes, testing data, photographs, notebooks, logbooks, and patent disclosures used in exhibits can be found under litigation files as well. The following organizations can be found amongst litigation; Admiral Corp., American Telephone & Telegraph, Co., Arvin Industries, Avco Corp., Bendix Radio and Aviation Corp,. De Forest Radio and Telegraph Co., DuMont Laboratories, Emerson Radio, FADA Radio and Electric Co., Gilfillan Bros., Hoffman Radio Corp., Fred M. Link, Motorola, Inc., Packard-Bell Co., Philco Corp., Radio and Television, Inc., Radio Corp. of America and the National Broadcasting Corp., the Radio Craftsman, Inc., Sentinel Radio, Sylvania Electric Products, Inc. and Wells-Gardner and Co. The litigation files found within this series should be researched in conjunction with series five as the two overlap.