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| Patents Granted on 1957-05-07 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,791,067 | May 07, 1957 | J.J. Falls | Grinding apparatus | bench or pedestal grinders | |
| 2,791,070 | May 07, 1957 | L. Schaller | Abrading machine | sanding machines | |
| 2,791,248 | May 07, 1957 | D.D. Beale | Plated saw blade | sawblades | |
| 2,791,304 | May 07, 1957 | J.W. Lehde, Jr., B.R. Better | Safe Torque Driver | drilling and boring tool holders | |