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US Patent: 293,761
Changeable Speed Gearing
Patentee:
Samuel W. Martin (exact or similar names) - Springfield, Clarke County, OH

USPTO Classifications:
74/370

Tool Categories:
metalworking machines : metalworking machine mechanisms : metalworking variable speed mechanisms

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Dec. 07, 1883
Granted: Feb. 19, 1884

Patent Pictures:
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