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US Patent: 6,469
Buoying Vessels over Shoals
Patentee: Abraham Lincoln (exact or similar names) - Springfield, IL USPTO Classifications: 114/123, 114/49 Tool Categories: Assignees: None Manufacturer: Not known to have been produced Witnesses: H. H. Sylvester Z. C. Robbins	Patent Dates: Granted: May 22, 1849 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin
Description: This is the only patent ever granted to a person who became a U. S. president.

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