| Patents for Henry L. Pratt |
Patents 1 -
10
of 12
      |
| Picture | Number | Date | Patentee | Title |
 | 60,207 | Dec. 04, 1866 | H.C. Lewis | Improved Countersink Bit |
 | 90,759 | Jun. 01, 1869 | H.C. Lewis | Single Twist Auger Bit |
 | 131,829 | Oct. 01, 1872 | H.L. Pratt | Improvement in bit-stocks |
 | D8,381 | Jun. 08, 1875 | H.L. Pratt | Design for Bracket Saw Frames |
 | 177,659 | May 23, 1876 | H.L. Pratt | Improvement in Scroll Saw Frames |
 | 194,109 | Aug. 14, 1877 | H.L. Pratt | Improvement in Drill-Chucks |
 | 200,757 | Feb. 26, 1878 | H.L. Pratt | Improvement in ratchet bit-braces |
 | RE8,525 | Dec. 17, 1878 | H.L. Pratt | Improvement in bit-stocks |
 | 292,176 | Jan. 22, 1884 | H.L. Pratt | Saw fastening and frame |
 | 345,256 | Jul. 06, 1886 | H.L. Pratt | Saw Frame |
