| All Patents in class 409/41 |
Patents 1 -
6
of 6
      |
| Picture | Number | Date | Patentee | Title |
 | 547,571 | Oct. 08, 1895 | H.C. Warren | Apparatus for cutting gear-teeth |
 | 559,011 | Apr. 28, 1896 | H.C. Warren | Machine for making spur gears |
 | 588,738 | Aug. 24, 1897 | H.C. Warren | Machine for generating gear-teeth |
 | 605,982 | Jun. 21, 1898 | H.C. Warren | Machine for generating gear-teeth |
 | 2,622,484 | Dec. 23, 1952 | D.M. Birrell | Worm Gear Cutting Attachment for Milling Machines |
| | 4,534,684 | Aug. 13, 1985 | B.H. Johnson | Apparatus For Milling A Gear For A Double Enveloping Worm Gear Drive |
