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US Patent: 249,117
Slide Rule
Patentee:
Edwin Thacher - Pittsburg, Allegheny County, PA

USPTO Classifications:
235/79.5

Tool Categories:
specialty tools : slide rules : cylindrical slide rules

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Feb. 03, 1881
Granted: Nov. 01, 1881

Patent Pictures:
USPTO pdf tiff
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