| Patents Granted on 1857-04-07 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| RE447 | Apr. 07, 1857 | S.R. Wilmot | Improved portable steam crosscut-sawing machine | drag saws |
| XC-721 | Apr. 07, 1857 | D.T. Curtis | New method of clamping frames, &c., by the double action eccentric lever clamp | miter and corner clamps |
| 16,964 | Apr. 07, 1857 | J.L. Brown | Shingle-machine | shingle machines |
| 16,980 | Apr. 07, 1857 | I. Kepler | Smut-Machine | smut mills |
| 16,997 | Apr. 07, 1857 | E. Ripley | Improved Adjustable Pincer-Wrench | wrench combination tools |
| 17,001 | Apr. 07, 1857 | M.S. Richardson, E. Hanson, H.S. Smith | Machine for manufacturing cylindrical boxes | box making machines |
| 17,014 | Apr. 07, 1857 | S. Sawyer, J. Sawyer | Machine for splitting hoop poles | wood splitting machines |
