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US Patent: 1,253,553
Apparatus for smoothing and calibrating tapered and curved hollow metal bodies, such as bows for wind instruments
Patentee: Benjamin F. Winterhoff (exact or similar names) - Elkhart, IN USPTO Classifications: 29/890.149, 72/316, 72/478, 72/479 Tool Categories: trade specific : music instrument maker Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jan. 21, 1916 Granted: Jan. 15, 1918 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Winterhoff Tool & Machine Co.

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