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US Patent: 389,480
Expanding Mandrel
Patentee:
John Massett (exact or similar names) - North Tarrytown, Westchester County, NY

USPTO Classifications:
384/249, 403/370, 82/169

Tool Categories:
metalworking tools : mandrels and arbors

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Jun. 19, 1888
Granted: Sep. 11, 1888

Patent Pictures:
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