| All Patents in class 81/31 |
Patents 1 -
10
of 22
      |
| Picture | Number | Date | Patentee | Title |
 | 139,667 | Jun. 10, 1873 | A.D. Goodell | Improvement in bit-stocks |
 | 175,151 | Mar. 21, 1876 | F.P. Pfleghar | Ratchet bit-brace |
 | 207,964 | Sep. 10, 1878 | H.C. Hart | Ratchet bit-stock |
 | 223,484 | Jan. 13, 1880 | A.H. Crockford | Bit-brace |
 | 228,810 | Jun. 15, 1880 | A.D. Goodell | Ratchet bit-brace |
 | 250,047 | Nov. 29, 1881 | Q.S. Backus | Bit-stock |
 | 283,844 | Aug. 28, 1883 | C.H. Amidon | Bit-stock |
| | 294,762 | Mar. 11, 1884 | W.R. Clarkson | Ratchet bit-brace |
 | 309,887 | Dec. 30, 1884 | A. Shepard | Ratchet brace with side levers |
 | 344,130 | Jun. 22, 1886 | J.L. Osgood | Bit-brace |
