| Patents Granted on 1957-04-30 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| D180,181 | Apr. 30, 1957 | R.O. Ernest | Portable electric saw | handheld circular saws |
| CH-321,209 | Apr. 30, 1957 | F.W. Deckel, H. Deckel | Machine Tool | |
| 2,790,280 | Apr. 30, 1957 | R.L. Henry, J.W. Wilson | Spindle Positioning Mechanism | grinding machines |
| 2,790,360 | Apr. 30, 1957 | P.P. Dubosclard | Milling machine | milling machines |
| 2,790,361 | Apr. 30, 1957 | H.E. Bargren, F.R. Swanson, W.S. Swanson | Jack mechanism | |
| 2,790,647 | Apr. 30, 1957 | E.M. Liberty, L.J. Gorgol | Transverse Pin Tool Holder | drilling and boring tool holders |
