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| All Patents in class 279/43.5 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 25,984 | Nov. 01, 1859 | N. Spofford | Bit-stock with clam-style chuck | |
 | RE2,576 | Apr. 23, 1867 | N. Spofford | Improvement in braces for bits | |
 | 78,157 | May 19, 1868 | I.C. Tate | Improvement in braces for bits | |
 | RE8,215 | May 07, 1878 | N. Spofford | Improvement in braces for bits | |
 | 225,768 | Mar. 23, 1880 | N. Spofford | Bit-brace | |
| 600,747 | Mar. 15, 1898 | J.K. Severson | Adjustable Tool Holder | ||
 | 790,479 | May 23, 1905 | W. Carr, J. Carr | Boring-tool holder | |