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US Patent: 185,706
Improvement in centering devices
Patentee:
William P. Tullock - Washington, DC

USPTO Classifications:
33/420

Tool Categories:
layout tools

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
S. A. Terry
D. W. Howard

Patent Dates:
Applied: Nov. 29, 1876
Granted: Dec. 26, 1876

Patent Pictures:
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Description:
The patent model for this appeared on ebay but it's unknown if it was ever manufactured.

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