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US Patent: 61,121
Improvement in boring-tools
Patentee:
Nathan Thompson (exact or similar names) - St. John's Wood, England

USPTO Classifications:
144/219, 408/206

Tool Categories:
metalworking machines : drilling and boring

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Granted: Jan. 08, 1867

Patent Pictures:
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