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| Patents Granted on 1957-04-30 | |||||
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| Number | Date | Patentee | Title | Type | |
| D180,181 | Apr. 30, 1957 | R.O. Ernest | Portable electric saw | handheld circular saws | |
| 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 | |