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US Patent: 651,142
Slide Rule
Patentee: Willie L. E. Keuffel (exact or similar names) - 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: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
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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