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All Patents of Type: spoon bits | |||||
Number | Date | Patentee | Title | Type | |
38,633 | May 19, 1863 | B. Sanderson | Bit or boring tool | spoon bits | |
81,069 | Aug. 18, 1868 | R. Cook | Spoon bit with lead screw | spoon bits | |
CA-297 | Mar. 19, 1870 | T. Switzer | A brace bit for boring and countersinking holes | countersinks |