| Patents Granted on 1957-05-?? |
Patents 1 -
15
of 33
      |
| 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 |
| 2,791,135 | May 07, 1957 | W.E. Twamley | Step Drilling Turret Indexing and Feeding Mechanism | |
| 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 |
| D180,271 | May 14, 1957 | R.C. Dreier | Hack Saw | hacksaws |
| 2,791,824 | May 14, 1957 | W.J. Greenleaf | Indexable Insert Tool Holder | insert tool holders |
| 2,791,825 | May 14, 1957 | W.J. Greenleaf | Cutting Tool Holder | insert tool holders |
| 2,791,836 | May 14, 1957 | H.J. Gerber | Instrument for measuring the slope of a curve at a selected point thereon | goniometers |
| 2,791,871 | May 14, 1957 | A.M. Johnson | Honing machine | honing machines |
| 2,791,885 | May 14, 1957 | B. Sassen | Hydraulic Tracer Control | hydraulic apparatus |
| 2,791,921 | May 14, 1957 | F.F. Rohrer, H.J. Ross, C.W. Heppenstall | Lathe System or the Like | metal lathes |
| 2,791,929 | May 14, 1957 | D. Bonade | Ligatures for clarinets or the like | musical instruments |
| 2,791,946 | May 14, 1957 | P.C. Hewett | Variable Conical Cutter | milling machines |
| 2,791,988 | May 14, 1957 | W.C. Fischer | Dual Fuel Internal Combustion Engine | fuel systems |
