| Patents Granted on 1855-03-20 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 12,543 | Mar. 20, 1855 | A.H. Crozier | Machine for cutting barrel-heads | barrel making machines |
| 12,551 | Mar. 20, 1855 | I.W. Hoagland | Auger Bit With Detachable Cutting Lip | auger bits |
| 12,552 | Mar. 20, 1855 | G. Hotchkiss | Railroad-car brake | railroad car brakes |
| 12,555 | Mar. 20, 1855 | F.D. Newbury | Revolver | revolvers |
| 12,563 | Mar. 20, 1855 | E. Street | Mortising and tenoning machine | mortising machines |
| 12,575 | Mar. 20, 1855 | C.W. Cotton | Attaching Augers to Handles | auger handles |
