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US Patent: 520,748
Method of Operating Electric Motors
Patentee:
John Sellers Bancroft - 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 pdf tiff
Google Patents
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"Vintage Machinery" entry for William Sellers & Co.

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