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US Patent: 164,392
Improvement in drop-hammers
Patentee: Francis A. Pratt (exact or similar names) - Hartford, CT USPTO Classifications: 72/436, 72/440 Tool Categories: Assignees: Pratt & Whitney Co. - Hartford, CT Manufacturer: Pratt, Whitney & Co. - Hartford, CT Witnesses: Theodore G. Ellis Wendell R. Curtis	Patent Dates: Applied: Mar. 19, 1875 Granted: Jun. 15, 1875 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Pratt & Whitney Co.
Description: Seen on an old Pratt & Whitney milling machine.

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