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US Patent: 371,740
Center Square
Patentee:
Samuel Darling (exact or similar names) - Providence, RI

USPTO Classifications:
33/456

Tool Categories:
layout tools : squares : bevel squares
layout tools : protractors

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Howard Greene
Jason H. Lange
Patent Dates:
Applied: Jul. 19, 1886
Granted: Oct. 18, 1887

Patent Pictures:
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