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US Patent: 73,532
Improvement in Combined Rule and Square
Patentee: W. O. Jones (exact or similar names) - Portland, ME USPTO Classifications: 33/495 Tool Categories: rules : folding rules : folding rule joints layout tools : squares : bevel squares Assignees: None Manufacturer: Not known to have been produced Witnesses: William Henry Clifford Henry C. Houston	Patent Dates: Granted: Jan. 21, 1868 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Improved rule hinge that allows it to open past the normal 180 degrees to 270 degrees forming a square or at lesser angles a bevel.

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