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US Patent: 160,471
Improvement in Stair-Builders' Rules
Patentee: John J. Robinson (exact or similar names) - Orange Court House, VA USPTO Classifications: 33/332, 33/342, 33/666 Tool Categories: rules : measuring rods trade specific : carpenter Assignees: None Manufacturer: Not known to have been produced Witnesses: A. Thomson Richard Chapman	Patent Dates: Applied: Dec. 17, 1874 Granted: Mar. 02, 1875 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin (dm)

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