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US Patent: 372,012
Electrical resistance-board
Patentee:
Irving W. Colburn - Fitchburg, MA

USPTO Classifications:
338/190

Tool Categories:
electrical devices

Assignees:
Hanson Van Winkle & Co. - Newark, NY

Manufacturer:
Not known to have been produced

Witnesses:
W. L. Ackley
S. L. Graves

Patent Dates:
Applied: Feb. 08, 1887
Granted: Oct. 25, 1887

Patent Pictures:
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Description:
"My invention relates to improvements in electrical resistance-boards to be used in connection with dynamo-electric machines for the purpose of regulating the intensity of the current."

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