| All Patents in class 72/221 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 3,156X | Dec. 24, 1819 | T. Rowand | Mode of hollowing out iron bar, tire for wagons, etc. | |
| 6,083X | Jul. 17, 1830 | G. Stoudinger | Steel rolling-mill for carriage springs | steel maker |
| 36,392 | Sep. 09, 1862 | J.P. Blake | Improvement in machinery for making sewing-machine needles | |
| 69,085 | Sep. 24, 1867 | D. Eynon | Improvement in rolling apparatus for rolling chairs for railroads | track and switches |
| 380,577 | Apr. 03, 1888 | J.H. Kane | Apparatus for Making Drills | making drills and augers |
| 909,341 | Jan. 12, 1909 | I.J. Shifley | Machine for Working Sheet Metal | sheet metal flanging machines |
| 2,630,149 | Mar. 03, 1953 | P.A. Rahaim | Apparatus for the manufacture of compressed wooden dowels | dowel making machines |
