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US Patent: 178,448
Improvement in Countersinks
Patentee: William H. Laughlin (exact or similar names) - Hinckley, OH USPTO Classifications: 408/192 Tool Categories: woodworking tools : hand drills : drill bits : countersinks Assignees: None Manufacturer: Not known to have been produced Witnesses: George W. Tibbits H. B. Tibbits	Patent Dates: Applied: Sep. 11, 1875 Granted: Jun. 06, 1876 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin (dm)

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