| All Patents in class 74/57 |
Patents 16 -
20
of 20
      |
| Number | Date | Patentee | Title | Type |
| 2,493,420 | Jan. 03, 1950 | R.W. Brown, H.H. Ranney | Cam Mechanism for Variable Length Throw | metalworking machine mechanisms |
| 2,525,922 | Oct. 17, 1950 | S. Mandl | Rotary-Reciprocating Motion Converter | |
| 3,416,582 | Dec. 17, 1968 | D.M. Jenks | Reduction driver | spiral screwdrivers |
| 3,980,252 | Sep. 14, 1976 | M. Tae | Wire rope spooling mechanism | hoists, winches, come-alongs |
| 4,990,037 | Feb. 05, 1991 | D.S. Strait | Portable Boring Machine | portable metal boring and drilling machines |
