| All Patents in class 72/440 |
Patents 1 -
10
of 21
      |
| Picture | Number | Date | Patentee | Title |
| | 8,548 | Nov. 25, 1851 | M. Peck | Drop Hammer |
 | 37,445 | Jan. 20, 1863 | W.C. Hicks | Improvement in drop-presses |
| | 41,775 | Mar. 01, 1864 | B. Hotchkiss | Drop Hammer |
| | 46,229 | Feb. 07, 1865 | F. Krautwadel, H.E. Fessel | Trip Hammer |
| | 68,295 | Aug. 27, 1867 | J. Tandler | Trip Hammer |
 | 132,173 | Oct. 15, 1872 | J. Neuberger | Improvements in Trip-Hammers |
 | 164,392 | Jun. 15, 1875 | F.A. Pratt | Improvement in drop-hammers |
| | RE7,788 | Jul. 10, 1877 | W.C. Hicks | Improvement in drop-presses |
 | 310,969 | Jan. 20, 1885 | A. Williams | Drop-hammer lifter |
 | 350,007 | Sep. 28, 1886 | F.M. Leavitt | Drop-hammer |
