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US Patent: 140,852
Improvement in clamps
Patentee:
John E. Sinclair (exact or similar names) - Worcester, MA

USPTO Classifications:
269/166, 269/221, 269/238

Tool Categories:
work holding : clamps

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Joseph S. Rogers
E. P. Barber

Patent Dates:
Applied: Nov. 11, 1872
Granted: Jul. 15, 1873

Patent Pictures:
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