The Harry F. Miller File contains contracts, financial material, correspondence, interoffice communications, and other legal and business records that were maintained by Miller in his capacities as Edison's personal business secretary and as an official in several Edison companies. The items for 1910 include documents relating to the ownership and disposition of the stock of the Edison Phonograph Works and International Graphophone Co. and a 16-page set of "Instructions for Keeping Various Solutions Under Control For the Production of Nickel Flake" for storage batteries.