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US Patent: 447,920
Method of operating arc lamps
Patentee:
Nikola Tesla - New York, NY

USPTO Classifications:
310/180, 310/40R, 315/246, 315/326

Tool Categories:
electrical devices : electric arc lamps

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Oct. 01, 1890
Granted: Mar. 10, 1891

Patent Pictures:
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