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All Patents of Type: spoon bits
Patents 1 - 3 of 3
First set of recordsLast set of records
38,633May 19, 1863B. SandersonBit or boring toolspoon bits
81,069Aug. 18, 1868R. CookSpoon bit with lead screwspoon bits
CA-297Mar. 19, 1870T. SwitzerA brace bit for boring and countersinking holescountersinks
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