| All Patents in class 29/90.6 |
Patents 1 -
7
of 7
      |
| Picture | Number | Date | Patentee | Title |
 | 1,989,652 | Jan. 29, 1935 | R.S. Drummond | Method for finishing internal gears |
| | 2,032,589 | Mar. 03, 1936 | E.A. Overstedt | Gear Lapping Machine |
| | 2,085,850 | Jul. 06, 1937 | W.H. Bock, J.C. Drader | Gear Speeder |
 | 2,111,045 | Mar. 15, 1938 | R.S. Drummond | Lapping machine |
| | 2,245,654 | Jun. 17, 1941 | J.D. Rovick, J.C. Drader | Gear Lapping and Finishing Machine |
| | 2,254,240 | Sep. 02, 1941 | E.A. Overstedt | Machine for Finishing Gears |
| | 2,257,195 | Sep. 30, 1941 | J.D. Rovick | Internal Gear Finishing Machine |
