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US Patent: 663,145
Chain-gear parallel carpenter's vise
Patentee:
Edward J. Zwart (exact or similar names) - St. Louis, MO

USPTO Classifications:
269/222, 269/256

Tool Categories:
work holding : vises : leg vises

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Benjamin Engelhardt
Anna Schoepf
Patent Dates:
Applied: Apr. 27, 1899
Granted: Dec. 04, 1900

Patent Pictures:
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Description:
Chain-drive parallel mechanism for a leg vise. The inventor claims that the mechanism can easily be retrofitted to an existing vise.

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