This folder contains correspondence and other documents relating to the business of Bergmann & Co. The company manufactured electric lighting fixtures, sockets, and other devices used with the Edison system of electric lighting, as well as equipment for the Edison phonoplex system of telegraphy. Some of the documents pertain to phonoplex battery experiments conducted by Charles Wirt, electrician of the company, while other material deals with increases in the company's capital stock.
Approximately 60 percent of the documents have been selected. The following categories of documents have not been selected: routine correspondence relating to accounts, stock certificates, and orders for phonoplex and electric light equipment; meeting announcements; other routine business correspondence; bills and receipts. Courtesy of Thomas Edison National Historical Park.