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US Patent: 871,970
System of motor control
Patentee:
Emmet W. Stull - Norwood, OH

USPTO Classifications:
200/5R, 200/7, 318/103, 318/58, 318/96

Tool Categories:
electrical devices : electric motors : motor controls
transportation machines : railroads and railways : electric railways

Assignees:
Bullock Electric Manufacturing Co. - Norwood, OH
Allis-Chalmers Co. - Milwaukee, WI

Manufacturer:
Allis-Chalmers Co. - Milwaukee, WI

Witnesses:
Fred J. Kinsey
George B. Schley

Patent Dates:
Applied: Mar. 31, 1906
Granted: Nov. 26, 1907

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Allis-Chalmers Manufacturing Co.
"Vintage Machinery" entry for Bullock Electric Manufacturing Co.
Description:
"My invention relates to controllers for electric motors, and particularly to railway controllers of the type adapted to control a plurality of motors. One of the objects of my invention is to enable injured or disabled motors to be cut out of circuit without affecting the action of the controller upon the remaining motors..."

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