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US Patent: 186,513
Improvement in Countersinks
Patentee: Dummer J. Adams (exact or similar names) - Kittery, ME USPTO Classifications: 408/146 Tool Categories: woodworking tools : hand drills : drill bits : countersinks Assignees: None Manufacturer: Unknown Witnesses: Enin I. Wilson John Wentworth	Patent Dates: Applied: Jan. 05, 1877 Granted: Jan. 23, 1877 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin (dm)
Description: Countersink with a slit conical head, slit bit that is adjusted longitudinally, and a securing screws. Know examples are marked with the patent date.

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