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US Patent: 450,640
Slide Rule for Logarithmic Calculations
Patentee:
Rudolph C. Smith (exact or similar names) - Yonkers, Westchester County, NY

USPTO Classifications:
235/70R

Tool Categories:
specialty tools : slide rules

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Sep. 15, 1888
Granted: Apr. 21, 1891

Patent Pictures:
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