| All Patents in class 72/439 |
Patents 16 -
30
of 80
      |
| Number | Date | Patentee | Title | Type |
| 305,165 | Sep. 16, 1884 | J.H. Elward | Drop-hammer | drop hammers |
| 327,082 | Sep. 29, 1885 | W. Hassel | Drop Hammer | drop hammers |
| 357,433 | Feb. 08, 1887 | W.S. Ward | Lifting device for drop-hammers | drop hammers |
| 363,351 | May 24, 1887 | H.A. Ainsworth | Drop-hammer | drop hammers |
| 370,952 | Oct. 04, 1887 | F.M. Leavitt | Drop-hammer | drop hammers |
| 380,808 | Apr. 10, 1888 | F.M. Leavitt | Drop-hammer | drop hammers |
| 401,566 | Apr. 16, 1889 | F.M. Leavitt | Drop-hammer | drop hammers |
| 459,607 | Sep. 15, 1891 | R.L. Barclay | Drop Hammer | drop hammers |
| 515,919 | Mar. 06, 1894 | E.W. Merrill | Drop Hammer | drop hammers |
| 524,311 | Aug. 14, 1894 | W.A. Cornbrooks | Drop Hammer | drop hammers |
| 534,008 | Feb. 12, 1895 | F.A. Pratt | Drop Hammer | drop hammers |
| 536,819 | Apr. 02, 1895 | J.L. Peck | Drop Hammer | drop hammers |
| 545,188 | Aug. 27, 1895 | F. Lombard, F.C. Billings | Drop Hammer | drop hammers |
| 547,197 | Oct. 01, 1895 | W.J. Belcher, F.C. Billings | Drop Hammer | drop hammers |
| 566,199 | Aug. 18, 1896 | F. Lombard | Drop Hammer | drop hammers |
