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US Patent: 1,661,935
Chuck for extension bits
Patentees: George O. Leopold (exact or similar names) - Philadelphia, PA Thomas J. Fegley (exact or similar names) - Philadelphia, PA USPTO Classifications: 279/90 Tool Categories: Assignees: None Manufacturer: North Brothers Manufacturing Co. - Philadelphia, PA Witnesses: Unknown	Patent Dates: Granted: Mar. 06, 1928 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Kirk Eppler "Vintage Machinery" entry for North Brothers Manufacturing Co.
Description: Basis of Yankee brace.

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