| All Patents in class 474/89 |
Patents 31 -
37
of 37
      |
| Number | Date | Patentee | Title | Type |
| 2,473,963 | Jun. 21, 1949 | R.E. McKelvey | Speed selection unit | drill presses |
| 2,474,500 | Jun. 28, 1949 | F.K. Stein | High-low speed attachment for drill presses | industrial machine pulleys and belt drive mechanisms |
| 2,506,514 | May 02, 1950 | R.E. McKelvey | Reduction drive for drill presses and the like | industrial machine pulleys and belt drive mechanisms |
| 2,528,686 | Nov. 07, 1950 | S.S. Brown | Motor drive unit | gear motors |
| 2,650,506 | Sep. 01, 1953 | K.R. Montgomery | Speed reducer for drill presses and other belt-driven machines | industrial machine pulleys and belt drive mechanisms |
| 2,956,595 | Oct. 18, 1960 | R.K. Holtz, E.C. Warrick, J. Kmetz | Drive means for combination circular saw and jointer | combination machines |
| 3,745,845 | Jul. 17, 1973 | G.L. Redman | Speed changer | industrial machine pulleys and belt drive mechanisms |
