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US Patent: 8,897
Improved Reflecting Spirit Level and Square
Patentee: Francis Wilbar (exact or similar names) - Roxbury, MA USPTO Classifications: 33/382 Tool Categories: layout tools : levels layout tools : squares Assignees: None Manufacturer: Not known to have been produced Witnesses: Allen Winsor John I. Clarke	Patent Dates: Applied: Feb. 13, 1852 Granted: Apr. 20, 1852 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Combination of spirit levels and mirrors primarly designed for layout of walls. Wood or other suitable material is designated for use in the body.

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