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US Patent: 2,185,471
Power hammer
Patentee: Arthur William Mall (exact or similar names) - Chicago, IL USPTO Classifications: 16/426, 173/104, 173/120, 173/205, 74/53 Tool Categories: Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jun. 15, 1937 Granted: Jan. 02, 1940 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Mall Tool Co.

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