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US Patent: 390,108
Center Drilling Machine
Patentee: Amos Whitney (exact or similar names) - Hartford, Hartford County, CT USPTO Classifications: 29/26R, 408/53 Tool Categories: metalworking machines : drilling and boring : center drilling machines Assignees: Pratt & Whitney Co. - Hartford, Hartford County, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 23, 1888 Granted: Sep. 25, 1888 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Pratt, Whitney & Co.
Description: This patent was an improvement on patent #376,838.

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