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US Patent: 185,706
Improvement in centering devices
Patentee: William P. Tullock (exact or similar names) - 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: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen
Description: The patent model for this appeared on ebay but it's unknown if it was ever manufactured.

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