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US Patent: 794,753
Illuminated Spirit-Level
Patentee: Raymond O. Stetson (exact or similar names) - Greenfield, MA USPTO Classifications: 33/348.2 Tool Categories: layout tools : levels Assignees: None Manufacturer: Not known to have been produced Witnesses: Edwin A. Stratton Forrest S. Stetson	Patent Dates: Applied: Dec. 27, 1902 Granted: Jul. 18, 1905 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: First patent for using electricity to illuminate the level vials.

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