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US Patent: 360,378
Plumb Level
Patentee: Edward Duffy (exact or similar names) - Pawtucket, RI USPTO Classifications: Tool Categories: layout tools : levels : inclinometers Assignees: None Manufacturer: Edward Duffy - Pawtucket, RI Witnesses: J. A. Miller, Jr. M. F. Bligh	Patent Dates: Applied: Nov. 08, 1886 Granted: Mar. 29, 1887 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Bob Endellicate
Description: A device or level for ascertaining the relative inclination or angle of a certain line or surface to a horizontal plane

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