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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
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