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US Patent: 1,665,504
Leveling Square
Patentee: USPTO Classifications: 33/334, 33/429, 33/451, 7/150 Tool Categories: Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 21, 1925 Granted: Apr. 10, 1928 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.

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