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US Patent: 1,082,880
Mechanical hammer
Patentee: James S. Knowlson (exact or similar names) - La Grange, IL USPTO Classifications: 173/99 Tool Categories: trade specific : miner Assignees: Electro-Magnetic Tool Co. - Chicago, IL Manufacturer: Electro-Magnetic Tool Co. - Cicero, IL Witnesses: O. C. Avisus D. C. Thorsen	Patent Dates: Applied: Feb. 15, 1913 Granted: Dec. 30, 1913 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Electro-Magnetic Tool Co.

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