| All Patents in class 409/21 |
Patents 1 -
10
of 11
      |
| Picture | Number | Date | Patentee | Title |
 | 1,091,493 | Mar. 31, 1914 | F.O. Farwell | Gear Hobbing Machine |
 | 1,252,482 | Jan. 08, 1918 | S.S. Cook, A.Q. Carnegie, C.A. Parsons | Gear Cutting Machine |
| | 1,274,583 | Aug. 06, 1918 | S.S. Cook, A.Q. Carnegie, C.A. Parsons | Gear Cutting Machine |
| | 1,274,584 | Aug. 06, 1918 | S.S. Cook, A.Q. Carnegie, C.A. Parsons | Gear Cutting Machine |
| | 1,274,585 | Aug. 06, 1918 | A.Q. Carnegie, C.A. Parsons, S.S. Cook | Gear Cutting Machine |
| | 2,073,917 | Mar. 16, 1937 | W.F. Zimmermann | Cutter Positioning Device for Hobbing Machines |
| | 2,113,124 | Apr. 05, 1938 | W.F. Zimmermann | Deflection Compensator |
| | 2,117,930 | May 17, 1938 | W.F. Zimmermann | Outboard Swivel Support |
| | 2,211,309 | Aug. 13, 1940 | W.F. Zimmermann | Power Operated Swivel Carriage for Hobbing Machines |
| | 2,330,167 | Sep. 21, 1943 | W.F. Zimmermann | Thermally Insulated Hobbing Machine |
