| Patents Granted on 1957-05-28 |
Patents 1 -
10
of 10
      |
| Number | Date | Patentee | Title | Type |
| D180,363 | May 28, 1957 | H.A. Hamberger | Automatic saw sharpener | sharpening machines |
| 2,793,479 | May 28, 1957 | P.C. Durland, M.H. Arms | Internal grinding machine | grinders |
| 2,793,485 | May 28, 1957 | J.G. Bentley, A.N. Emmons | Grass trimmer | |
| 2,793,547 | May 28, 1957 | M.L. Benjamin, F.E. Winnen | Adjustable bit boring bar | facing heads |
| 2,793,551 | May 28, 1957 | M.M. Ford | Rotatable Impact Tool Holder | tool holders |
| 2,793,552 | May 28, 1957 | F.G. Clark | Magnetic Socket Wrench Having Spaced Pole Pieces | socket wrenches |
| 2,793,568 | May 28, 1957 | E.G. Roehm, M.E. Martellotti | Automatic Contouring Machine for Producing Warped Surfaces | milling machines |
| 2,793,660 | May 28, 1957 | B.E. Porter | Gang saw with removable frame | |
| 2,793,714 | May 28, 1957 | F.O. Luenberger | Lubrication system for enclosed transmission | industrial machine lubrication |
| 2,793,867 | May 28, 1957 | H.O. Stuart | Self Aligning Tool Holder for Turret Lathes | drilling and boring tool holders |
