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US Patent: 1,311,942
Electromagnetically-controlled board drop-hammer
Patentees: Howard Terhune (exact or similar names) - Chambersburg, PA Arthur Aldridge (exact or similar names) - Chambersburg, PA USPTO Classifications: 72/20.2, 72/439 Tool Categories: metalworking machines : forging machines : drop hammers Assignees: Chambersburg Engineering Co. - Chambersburg, PA Manufacturer: Chambersburg Engineering Co. - Chambersburg, PA Witnesses: Unknown	Patent Dates: Applied: Oct. 30, 1917 Granted: Aug. 05, 1919 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Chambersburg Engineering Co.

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