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These documents, which cover the period 1872-1929, include both notebooks and unbound technical notes and drawings. Among the bound volumes is an 1872 notebook in Edison's hand consisting of drawings of escapement mechanisms. Also included is Menlo Park Notebook #36 containing one page of unsigned entries from January-March 1879, along with a notebook from 1902, primarily by Edison, relating to storage battery experiments. The unbound documents, which appear in chronological order, include technical notes and drawings by Edison, Charles Batchelor, and Francis Jehl. They relate primarily to incandescent lamps, motors, dynamos, and other components of Edison's electric lighting system. Also included are notes and drawings pertaining to the telegraph, telephone, and storage battery Courtesy of the Henry Ford Museum and Greenfield Village Research Center.