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US Patent: 651,142
Slide Rule
Patentee:
Willie L. E. Keuffel - Hoboken, NJ

USPTO Classifications:
235/70R, 33/809

Tool Categories:
rules : slide rules

Assignees:
Keuffel & Esser Co. - Hoboken, NJ

Manufacturer:
Keuffel & Esser Co. - Hoboken, NJ

Witnesses:
Herman H. Stutz
Oscar Wiener

Patent Dates:
Applied: Sep. 13, 1899
Granted: Jun. 05, 1900

Patent Pictures:
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Description:
Adjustment of the slotted base of the slide rule to ensure proper movement and resistance when manipulating the slide by use of bolts or screws.

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