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US Patent: 540,184
Markre for Slide Rules
Patentee:
Thaddeus Norris - Washington, DC

USPTO Classifications:
235/70B, 235/84, 359/442

Tool Categories:
specialty tools : slide rules : cursors
specialty tools : slide rules : circular slide rules

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Oct. 24, 1894
Granted: May 28, 1895

Patent Pictures:
USPTO pdf tiff
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