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US Patent: 520,748
Method of Operating Electric Motors
Patentee: John Sellers Bancroft (exact or similar names) - Philadelphia, PA USPTO Classifications: 200/18, 200/50.32, 318/154, 318/55, 318/82 Tool Categories: electrical devices : electric motors : motor controls Assignees: William Sellers & Co., Inc. - Philadelphia, PA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 10, 1892 Granted: May 29, 1894 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for William Sellers & Co.

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