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US Patent: 299,552
Electro-Magnetic Indicator
Patentee: Warren Seymour Johnson (exact or similar names) - Whitewater, Walworth County, WI USPTO Classifications: 318/695, 340/319, 340/870.17, 340/870.23, 374/206 Tool Categories: electrical devices : magnetic transducers Assignees: Warren Seymour Johnson - Whitewater, Walworth County, WI William Plankinton - Milwaukee, Milwaukee County, WI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 10, 1883 Granted: Jun. 03, 1884 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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