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US Patent: 390,108
Center Drilling Machine
Patentee:
Amos Whitney - 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 pdf tiff
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"Vintage Machinery" entry for Pratt, Whitney & Co.
Description:
This patent was an improvement on patent #376,838.

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