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US Patent: 73,532
Improvement in Combined Rule and Square
Patentee:
W. O. Jones - 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 pdf tiff
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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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