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US Patent: 407,515
Draftsman's Protractor
Patentee:
William W. Duffield (exact or similar names) - Detroit, MI

USPTO Classifications:
33/1M, 33/1R

Tool Categories:
layout tools : protractors

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: May 02, 1889
Granted: Jul. 23, 1889

Patent Pictures:
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