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US Patent: 520,778
Engravers Chuck
Patentee:
Henry Gruner (exact or similar names) - Philadelphia, PA

USPTO Classifications:
81/4

Tool Categories:
trade specific : engraver
work holding : vises : chucks
trade specific : watchmaker

Assignees:
Keystone Watch Case Co. - Philadelphia, PA

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: May 22, 1893
Granted: Jun. 05, 1894

Patent Pictures:
USPTO (New site tip)
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