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US Patent: 794,753
Illuminated Spirit-Level
Patentee:
Raymond O. Stetson - 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:
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Description:
First patent for using electricity to illuminate the level vials.

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