| All Patents in class 408/175 |
Patents 1 -
8
of 8
      |
| Picture | Number | Date | Patentee | Title |
 | 53,216 | Mar. 13, 1866 | L.A. Dole | Improvement in machines for boring hubs |
| | 270,618 | Jan. 16, 1883 | E.J. Voegtlin | Screw Cutting Die |
 | 500,498 | Jun. 27, 1893 | L.S. Hayden | Expansive Bit |
| | 841,396 | Jan. 15, 1907 | F.W. Hoefer | Machine for Threading Pipes |
| | 1,434,995 | Nov. 07, 1922 | H. Francis | Cutting or Boring Tool or Boring Head |
 | 1,546,138 | Jul. 14, 1925 | D. Lambert | Expanding Cutter |
| | 1,870,350 | Aug. 09, 1932 | F.D. Van Norman | Adjustable boring head |
| | 1,998,113 | Apr. 16, 1935 | W.H. Fritz, E.E. Anderson | Reamer |
