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US Patent: 49,037
Improvement in Carpenters' Rules
Benjamin G. Martin - Philadelphia, PA

USPTO Classifications:
33/341, 33/391, 33/458

Tool Categories:
rules : rule accessories
layout tools : levels
layout tools : bevels

Benjamin G. Martin - Philadelphia, PA
Thos. M. Davis - Philadelphia, PA
LLoyd H. Walton - Philadelphia, PA
Watson Sanford - Philadelphia, PA

Not known to have been produced

Benj. Morison
Thomas M. Revis

Patent Dates:
Granted: Jul. 25, 1865

Patent Pictures:
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Utilizes an ordinary carpenter rule with a pointed swinging arm to serve as a plumb level along with an index and pointer to determine the angle of inclination providing the carpenter with a rule, level, square, and bevel at minimum cost.

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