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US Patent: 194,221
Improvement in cutter-heads for grooving and channeling
Patentee: Frank S. Clarkson (exact or similar names) - Baltimore County, MD USPTO Classifications: 144/219 Tool Categories: woodworking machines : machine and tool cutters : cutterheads Assignees: Frank B. Sloan - Baltimore, MD Richard Cromwell - Baltimore, MD C. Sidney Norris & Co. - Baltimore, MD Manufacturer: Joseph Clarkson & Son - Baltimore, MD Witnesses: Emil A. Dapper J. W. Holcomb	Patent Dates: Applied: Jul. 12, 1877 Granted: Aug. 14, 1877 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Joseph Clarkson & Son Vintage Machinery entry for C. Sidney Norris & Co.
Description: The assignees Cromwell and Sloan are described as "composing the firm of C. Sidney Norris & Co."

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