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US Patent: 282,966
Combined Protractor, Square, and Bevel
Patentees:
James Duckworth (exact or similar names) - Springfield, MA
Eli Smith (exact or similar names) - Springfield, MA

USPTO Classifications:
33/473

Tool Categories:
layout tools : bevels
layout tools : levels
layout tools : squares

Assignees:
None

Manufacturer:
Unknown

Witnesses:
H. A. Chapin
J. D. Garfield

Patent Dates:
Applied: Jun. 22, 1883
Granted: Aug. 14, 1883

Patent Pictures:
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