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US Patent: 423,969
Spirit-Level
Patentee: Justus A. Traut (exact or similar names) - 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: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
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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