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US Patent: 1,777,429
Level
Patentee: Richard C. Charlton (exact or similar names) - Philadelphia, PA USPTO Classifications: 33/381 Tool Categories: layout tools : levels : metallic levels Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 08, 1926 Granted: Oct. 07, 1930 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Lightweight open frame level with T-shaped cross section. Inventor indicates aluminum alloy is the recommended construction material.

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