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US Patent: 511,736
Attachment for boring-mills
Taper attachment and feed mechanism for vertical boring mill
Charles Leon Libby - Bridgeport, CT

USPTO Classifications:
408/237, 409/190, 82/11

Tool Categories:
metalworking machines : drilling and boring : vertical boring mills

Edward P. Bullard - Bridgeport, CT

Bridgeport Machine Tool Works - Bridgeport, CT
Bullard Machine Tool Co. - Bridgeport, CT

M. C. Hinchcliffe
A. J. Tanner

Patent Dates:
Applied: Dec. 05, 1892
Granted: Dec. 26, 1893

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Bridgeport Machine Tool Works
"Vintage Machinery" entry for Bullard Machine Tool Co.

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