This folder contains correspondence and other documents relating to the purchase and use of tools and raw materials in Edison's laboratory and factories. Included are items pertaining to motors, tools, camping gear, and rotary crushers. Also included are letters regarding chemical compounds such as Tripoli (amorphous silicon dioxide), Kieselguhr (diatomaceous earth), and "refined Trinidad Manjak" (a bituminous material). The correspondents include Ralph L. Fuller & Co., Harley-Davidson Motor Co., Sturtevant Mill Co. and Trinidad-Tarouba Oil Development Co.

Approximately 20 percent of the documents have been selected. The unselected material includes routine correspondence about catalog requests, orders, and shipping, which were handled by the laboratory staff.