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US Patent: 423,969
Spirit-Level
Patentee:
Justus A. Traut - New Britain, CT

USPTO Classifications:
33/384

Tool Categories:
layout tools : levels : level adjustments

Assignees:
The Stanley Rule & Level Co. - New Britain, CT

Manufacturer:
The Stanley Rule & Level Co. - New Britain, CT

Witnesses:
George W. Traut
F. N. Stanley
John Edwards, Jr.
W. H. Whiting

Patent Dates:
Applied: Dec. 28, 1889
Granted: Mar. 25, 1890

Patent Pictures:
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Description:
This design covers an adjustment mechinism for level vials, which was used on Stanley's high-end levels for many years.

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