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US Patent: 2,867,139
Boring unit
Patentee: Harry J. Caldwell (exact or similar names) - Rockford, IL USPTO Classifications: 408/151, 82/1.2 Tool Categories: Assignees: Barnes Drill Co. - Rockford, IL Manufacturer: Barnes Drill Co. - Rockford, IL Witnesses: Unknown	Patent Dates: Applied: Jan. 28, 1957 Granted: Jan. 06, 1959 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Barnes Drill Co.

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