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US Patent: 285,389
Atmospheric hammer
Patentee: John C. Butterfield (exact or similar names) - Chicago, IL USPTO Classifications: 74/582 Tool Categories: metalworking machines : forging machines : drop hammers Assignees: None Manufacturer: Not known to have been produced Witnesses: J. C. Turner R. D. O. Smith	Patent Dates: Applied: May 08, 1883 Granted: Sep. 25, 1883 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin
Description: Improvements to patent RE4,470.

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