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US Patent: 407,350
Parallel Ruler
Patentee:
John J. Hamilton - St. Louis, MO

USPTO Classifications:
33/454

Tool Categories:
rules : parallel rules

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 22, 1889
Granted: Jul. 23, 1889

Patent Pictures:
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