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US Patent: 280,426
Focus Regulator for Electric Arc Lamps
Patentee:
William Wheeler (exact or similar names) - Cocord, Middlesex County, MA

USPTO Classifications:
250/204, 250/554, 314/63, 314/76, 315/151, 315/155, 318/480, 318/640, 362/261

Tool Categories:
electrical devices : electric arc lamps

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Mar. 29, 1881
Granted: Jul. 03, 1883

Patent Pictures:
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