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These folders contain correspondence and other documents relating to legal matters involving Edison's phonograph. The selected documents cover the period 1899-1910. Among the correspondents are Edison, Frank L. Dyer, Herbert H. Dyke, Howard W. Hayes, and other members of Edison's legal staff. Some material pertains to labeling phonographs and records, particularly to names or works used as trademarks and trade names. Some items concern existing patents and their relation to perfected or proposed innovations by Edison, his employees, or others. Research subjects include nickel-in-the-slots devices, modified reproducers, attachments, a feed mechanism, a tapering tone arm, a return device, and "indestructible" records. The patent holders include Edison, Thomas H. Macdonald, Ademor N. Petit, and Peter Weber. In addition, there is material dealing with proposed litigation, along with items that were collected in anticipation of legal agreements or disputes. Some of the documents pertain to the formation of the Douglas Phonograph Co. and to contracts with sales agents. Other items concern research done on state tax codes, state laws regarding hawkers and peddlers, the municipal boundaries of Belleville, New Jersey, and installment sales contracts. Also included are letters and interoffice communications regarding Daniel Higham's mechanical amplification patents; the development and sale of celluloid and 200-thread records; and musical copyright in Great Britain and under the Berne Convention.