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US Patent: 121,074
Improvement in boring-machines
Patentees:
Charles F. Ritchel - New York, NY
Frank S. Allen - New York, NY

USPTO Classifications:
38/60, 408/47

Tool Categories:
metalworking machines : drilling and boring
woodworking machines : wood drilling and boring

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
T. B. Mosher
James T. Graham

Patent Dates:
Granted: Nov. 21, 1871

Patent Pictures:
USPTO pdf tiff
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