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Patent number:
Patent Date:
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:
USPTO
(New site tip)
Google Patents
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