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US Patent: 536,116
Extensible bit-stock
Patentees: Horace G. Worthington (exact or similar names) - Washington, DC William Wheeler (exact or similar names) - Washington, DC USPTO Classifications: 81/30 Tool Categories: Assignees: James M. White - Washington, DC Manufacturer: Not known to have been produced Witnesses: E. W. Bradford Nathan Weill	Patent Dates: Applied: Nov. 17, 1894 Granted: Mar. 19, 1895 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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