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These records cover the period 1899-1928, with most of the documents dating from 1899-1912. They relate primarily to the activities of the officers and senior managers of EPCCo. Among the correspondents are Edison; Walter S. Mallory, vice president and, later, president; Robert H. Thompson, an investor and director who became president in 1907; Theron I. Crane and his successors as secretary, Willard P. Reid and John E. Horne; William S. Pilling and his successors as treasurer, John F. Randolph and Harry F. Miller. Other EPCCo employees who are correspondents include Edward A. Darling and Frederick Siefke, engineers; Emil Herter and William Simpkin, draftsmen; Herman E. Kiefer, chemist; William H. Mason, superintendent; and Francis R. Upton, sales agent and longtime Edison associate. Included are items concerning the organization of EPCCo and the construction of its cement plant at Stewartsville, New Jersey. Also included is material pertaining to land surveys, production, sales, chemical analyses, quarrying, and product quality. Some of the documents relate to the New Jersey and Pennsylvania Concentrating Works and the Edison Crushing Roll Co.
The following categories of documents have been selected: items reflecting Edison's experiments, views on company policies, and direct intervention in, and supervision of, company matters; overviews, summaries, reports, and general descriptions of operations, technologies, company finances, and marketing strategies; descriptions of company products; and other items that bear substantive Edison marginalia. Also included are documents pertaining to Edison's health, schedule, and family, as well as his relations with investors.
The following categories of documents have not been selected: capital calls; meeting announcements; statements of accounts payable; canceled checks and check books; lists of bills; trial balances; payrolls, vouchers, and labor statements; routine employment applications; price lists and quotations; stationery and blank forms; letters of transmittal and acknowledgment; and routine correspondence with vendors and customers. Also not selected are routine letters, memoranda, reports, and cost sheets in the office files of the vice president (1900- 1903) and president (1917-1922).