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US Patent: 100,772
Centerer
Patentee:
Daniel Kelly - Philadelphia, PA

USPTO Classifications:
408/112, 408/84

Tool Categories:
metalworking machines : drilling and boring : drill bits

Assignees:
Daniel Kelly - Philadelphia, PA
Walter K. Ludwig - Philadelphia, PA

Manufacturer:
Not known to have been produced

Witnesses:
Walter K. Ludwig
Theodore F. Conover
John F. Brooks
Edgar Tate

Patent Dates:
Granted: Mar. 15, 1870

Patent Pictures:
USPTO pdf tiff
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Description:
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