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US Patent: 316,530
Line Chalker and Plumb Bob
Patentees: James Livingstone Downie (exact or similar names) - Allegheny, PA Eugene Hardin (exact or similar names) - Allegheny, PA USPTO Classifications: 33/332, 33/414 Tool Categories: layout tools : plumb bobs Assignees: None Manufacturer: Unknown Witnesses: J. I. Anderson B. M. Downie	Patent Dates: Applied: Jan. 12, 1885 Granted: Apr. 28, 1885 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.

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